DPF Cleaning: Fuel Additives Explained

Do You Need Fuel Additives to Clean a DPF Filter?

A clean Diesel Particulate Filter (DPF) is absolutely crucial for maintaining optimal vehicle performance and ensuring compliance with emission control standards. This essential component, often referred to as a soot filter, diligently traps soot particles expelled by diesel engines, significantly reducing harmful carbon emissions. The DPF is not merely an optional extra; it's an integral and compulsory part of a modern diesel vehicle's exhaust system. When this vital filter malfunctions or begins to operate improperly, a DPF cleaning additive can be a highly effective first step towards rectifying the issue. As the old adage goes, prevention is indeed better than cure. Proactively using these additives can act as a powerful preventative measure, potentially averting premature DPF failure and saving you from the substantial costs associated with extensive repairs or replacements.

In this comprehensive guide, we will delve into the intricacies of clearing a blocked DPF filter, showcasing how products like those from JLM can assist. We will also identify common DPF problems and explore why regular DPF cleaning is a cornerstone of affordable vehicle maintenance and peak performance.

Why Do I Need to Clean My DPF?

DPF filters naturally accumulate soot as part of their core function – trapping these emissions. This build-up is a gradual process that intensifies over time. Certain driving conditions can accelerate this clogging. For instance, frequent driving in heavy traffic, such as experiencing traffic jams or predominantly city driving, can lead to a more rapid accumulation of soot. To mitigate this and prevent the need for costly DPF replacements, the regular use of fuel additives specifically designed for DPF cleaning is highly recommended. Consistent use of high-quality DPF cleaning additives, such as those found in the JLM DPF product range, offers significant cost savings in the long run, enhances vehicle performance, and contributes to reduced emissions.

DPF Cleaning with Additives: Which Cleaner is Right for You?

When it comes to cleaning your DPF filter, it is imperative to exclusively use products that are specifically formulated for this purpose and are of the highest quality. JLM offers a diverse array of DPF cleaning solutions, meticulously engineered to serve as preventative measures, thereby helping you to avoid expensive replacement costs down the line.

JLM DPF ReGen Plus

As a key component of the JLM DPF product line, JLM DPF ReGen Plus stands out. This is a preventative DPF additive developed to actively support the DPF regeneration process, making it particularly beneficial for vehicles that undertake low-mileage journeys or frequent short trips. Regular application of ReGen Plus leads to improved regeneration cycles and enhanced DPF performance, whilst simultaneously reducing the likelihood of engine power loss.

How to Use JLM DPF ReGen Plus

• Step 1: Carefully remove the fuel cap.
• Step 2: Pour 250 ml of Diesel DPF ReGen Plus into the fuel tank for every 50 litres of diesel.
• Step 3: Securely close the fuel cap and commence driving.
• Step 4: Avoid refuelling until the fuel tank is nearly empty.

JLM DPF Cleaner

JLM also provides the JLM DPF Cleaner, a more potent formula enriched with Platinum and Cerium. This product represents the next logical step if DPF regeneration, supported by ReGen Plus, proves insufficient. JLM DPF Cleaner not only effectively clears the DPF but also actively reduces pollutants such as carbon monoxide. This cleaner is best applied as soon as the DPF dashboard warning light illuminates.

How to Use JLM DPF Cleaner

• Step 1: Add 375 ml of JLM DPF Cleaner to approximately 60 litres of diesel fuel, either before or after filling the tank.
• Step 2: Drive the vehicle normally, incorporating a longer, steady journey of at least 30-40 minutes to facilitate regeneration.
• Step 3: Refrain from refuelling until the fuel tank is nearly empty.

JLM DPF Cleaning Spray

If you need to get your vehicle back on the road swiftly, the JLM DPF Cleaning Spray offers a rapid and cost-effective solution for cleaning your DPF filter. It's important to note that this single-shot spray formulation is applied directly to the DPF and, consequently, requires a degree of basic mechanical aptitude for correct application.

How to Use JLM DPF Cleaning Spray

Before commencing, it is essential to take the appropriate safety precautions. Always wear protective gloves and safety goggles throughout the entire cleaning process.

• Step 1: Bring the engine up to its normal operating temperature and then switch it off.
• Step 2: Carefully remove the temperature sensor and/or pressure sensor.
• Step 3: Insert the spray pipe, equipped with a special nozzle, into the opening that leads into the particulate filter.
• Step 4: Dispense the entire contents of the can directly into the diesel particulate filter.
• Step 5: Reinstall the temperature sensor and/or pressure sensor.

Important Note: For optimal results, it is highly recommended to add JLM DPF Cleaner to the fuel tank after applying the DPF Spray and before initiating the regeneration process.

• Step 6: Initiate the DPF regeneration, either by using a diagnostic tool or, ideally, by undertaking a test drive.
• Step 7: Check the engine management system for any stored error codes and clear them if present.

JLM DPF Clean and Flush Toolkit

Finally, JLM also offers the DPF Clean and Flush Toolkit, a professional-grade solution designed for workshop use. This involves a two-stage cleaning process and requires a dedicated toolkit along with a compressed air supply. This kit is capable of cleaning heavily soiled diesel particulate filters without the need for dismantling, resulting in significant cost savings for the vehicle owner.

How to Choose a DPF Cleaner

In summary, JLM provides a wide spectrum of options for addressing a blocked DPF filter. If you find yourself uncertain about the best course of action, please do not hesitate to contact us or seek professional guidance.

DPF FAQs

Consult our FAQ section on Diesel Particulate Filter (DPF) cleaning for valuable insights into symptom identification and preventative maintenance tips. Discover essential information for maintaining peak engine performance and proactively reducing emissions.

How Do I Know My DPF Needs Cleaning?

Several clear indicators suggest that your Diesel Particulate Filter (DPF) might require cleaning:

• Warning Lights: Most contemporary vehicles are equipped with a dedicated dashboard warning light that specifically signals DPF issues. If this light is illuminated, it is crucial to address the problem promptly.
• Reduced Performance: A noticeable decline in engine performance, manifesting as a loss of power or an increase in fuel consumption, can be a strong indicator of a clogged DPF.
• Frequent Regeneration: If your vehicle frequently enters the regeneration mode – the process where accumulated soot is burned off within the DPF – it could signify that the filter is nearing its capacity and requires cleaning.
• Exhaust Smoke: An increase in visible exhaust smoke, particularly if it appears darker and denser, may suggest a DPF blockage.
• Poor Fuel Efficiency: A blocked DPF can lead to increased fuel consumption due to the improper flow of exhaust gases, forcing the engine to work harder to maintain optimal performance levels.
• Rough Idling or Engine Stalling: Accumulated blockages within the DPF can result in increased back pressure, leading to a loss of power and occasional engine stalling.
• Unusual Noises: Peculiar sounds emanating from the exhaust system, such as rattling or hissing, can also be indicative of a DPF issue.

If you observe any of these symptoms and suspect your DPF filter may be blocked, it's advisable to inspect for any visible damage or leaks in the DPF housing. Other visible signs include soot or ash accumulation on the DPF filter itself. A clean filter typically exhibits a light colour, whereas a clogged one may present a dark, ashy coating.

Should you notice any of these signs, it is strongly recommended to have your DPF inspected and cleaned by a professional to maintain optimal engine performance and ensure compliance with emission standards. Regular maintenance, coupled with prompt attention to emerging issues, can significantly extend the lifespan of your DPF and prevent costly repairs.

How Can I Prevent DPFs from Getting Dirty?

To ensure the longevity and optimal functioning of your Diesel Particulate Filter (DPF) and to preemptively address potential issues, consider adopting the following driving habits:

• Regular Driving at Highway Speeds: If your vehicle is primarily used for short trips, incorporating regular highway drives is highly beneficial. Extended driving at consistent speeds, especially at slightly higher revs (achieved by dropping down a gear), allows the DPF to reach higher operating temperatures, promoting efficient self-cleaning through regeneration.
• Avoid Short Trips: Whenever feasible, minimise frequent short journeys. These trips may not provide sufficient time for the DPF to reach its optimal operating temperature, increasing the likelihood of soot accumulation.
• Use Quality Diesel Fuel: Opt for high-quality diesel fuel with a low sulphur content. This helps minimise the production of soot and ash, thereby reducing the strain on the DPF.
• Avoid Engine Idling: Prolonged engine idling can contribute to incomplete combustion and increased soot production. It's advisable to switch off the engine when parked for extended periods.
• Maintain a Consistent Speed: Smooth and consistent driving, avoiding frequent rapid acceleration and deceleration, aids in optimising combustion and reduces the formation of excessive soot.
• Regular Maintenance: Adhere strictly to the manufacturer's recommended maintenance schedule for your vehicle. Ensure that the engine, exhaust system, and DPF are consistently in good working order. Utilise JLM DPF cleaning products for routine cleaning to maintain the DPF's condition.
• Avoid Overloading: Overloaded vehicles can place additional strain on the engine, potentially leading to increased soot production. Always adhere to the recommended load limits for your vehicle.
• Keep Air Filters Clean: A clean air filter is essential for ensuring proper air intake, which contributes to efficient combustion and reduces the likelihood of DPF-related issues.

By integrating these driving habits into your routine, you can significantly promote the longevity and optimal performance of your DPF, thereby minimising the risk of blockages and associated problems.

Use JLM Products for High-Quality DPF Cleaning

It is paramount to regularly clean your DPF filter using high-quality products to keep overall costs manageable and ensure the continued health of your vehicle. JLM offers an extensive range of products specifically formulated to clean DPF filters, catering to various levels of cleaning requirements. Explore our product selection to find the solution best suited to your specific needs. If you're finding it challenging to identify the most appropriate cleaning solution, please reach out to us or seek professional advice.

What is a Diesel Particulate Filter (DPF)?

A Diesel Particulate Filter (DPF) plays a critical role in capturing harmful emissions from diesel engines. However, it can become clogged over time, leading to diminished engine performance, increased fuel consumption, and potentially expensive repairs. A direct-apply DPF cleaner offers a convenient solution, enabling vehicle owners to clean the filter without necessarily requiring professional assistance. Below is a step-by-step guide on how to effectively use a direct-apply DPF cleaner.

Step 1: Gather Your Materials

Before you begin, ensure you have the following items readily available:

• A high-quality direct-apply DPF cleaner.
• A wrench or socket set (if removing a sensor is necessary).
• Safety gloves and protective eyewear.
• A clean cloth or paper towels.
• A vehicle diagnostic tool (optional, but highly beneficial for monitoring DPF status).

Step 2: Prepare the Vehicle

Park your vehicle on a level surface and confirm that the engine is switched off and has cooled down. Engage the handbrake and ensure the vehicle is in neutral or park mode.

Locate the DPF pressure or temperature sensor. This is typically found near the exhaust system, upstream of the DPF unit.

Step 3: Access the DPF System

If your chosen cleaner requires direct application through the sensor port, carefully remove the sensor using an appropriate wrench or socket set. If your cleaner allows application via an alternative method, meticulously follow the specific instructions provided with the product.

Step 4: Apply the DPF Cleaner

Shake the DPF cleaner canister thoroughly before use. Insert the cleaner nozzle or hose into the DPF sensor opening. Spray the entire contents of the cleaner into the filter in short, controlled bursts, allowing the cleaning solution sufficient time to penetrate and break down the accumulated soot deposits. Once applied, allow the cleaner to dwell for the recommended duration (typically 10-15 minutes) to effectively break down the soot and ash build-up.

Step 5: Reassemble and Secure Components

Carefully reinstall the DPF sensor and ensure it is securely tightened. Use a clean cloth or paper towel to wipe away any excess cleaner from around the sensor port. Double-check that all components are securely fastened before proceeding to the subsequent step.

Step 6: Start the Engine and Perform a Regeneration Drive

Start the engine and allow it to idle for a few minutes to enable the cleaner to begin its action. Subsequently, take the vehicle for a drive, ideally at motorway speeds (50-70 mph) for a minimum of 20-30 minutes. This extended drive is crucial to allow the DPF to regenerate effectively. If you are using a diagnostic tool, monitor the DPF status to confirm the successful completion of the regeneration process.

Step 7: Observe Vehicle Performance

Following the regeneration drive, check the dashboard for any illuminated warning lights. You should observe smoother acceleration, improved fuel efficiency, and a reduction in exhaust emissions. If DPF-related issues persist, consider repeating the cleaning process or seeking professional assistance.

Additional Tips for Maintaining a Clean DPF

• Utilise a direct-apply DPF cleaner as part of your routine maintenance schedule to prevent the development of severe blockages.
• Avoid excessive short trips and prolonged low-speed driving, as these conditions hinder proper DPF regeneration.
• Periodically drive at higher speeds on motorways to encourage passive regeneration.
• Remain vigilant for the DPF warning light and address any issues promptly to circumvent costly repairs.

Employing a direct-apply DPF cleaner is a straightforward and cost-effective method for maintaining your vehicle's Diesel Particulate Filter and ensuring its engine operates efficiently. By adhering to this step-by-step guide, you can effectively eliminate soot build-up, restore engine performance, and reduce harmful emissions. Consistent regular maintenance and proactive care will undoubtedly extend the service life of your DPF, saving you both time and money in the long run.

What is a DPF in a Diesel Engine? Your Guide to DPF Cleaners and DPF Cleaning

By Andy, Published on Thursday, May 14th, 2015

This article, now in its second iteration, has been updated to reflect the common problems encountered when addressing DPF blockages. We will cover the following key areas: What a DPF is, why DPFs become clogged, common misdiagnoses and related faults, reasons why a DPF cleaner might not be effective, and the logical steps for diagnosing and rectifying a DPF blockage.

What is a DPF?

A Diesel Particulate Filter (DPF) is an integral component of the exhaust emission control system. Its primary function is to capture particulate matter and hydrocarbons, storing them within the filter. Periodically, a regeneration process occurs where these trapped deposits are burned off at high temperatures, converted into carbon dioxide (CO2), and then vented out through the exhaust.

Why Do DPFs Clog Up?

Several factors contribute to DPF clogging:

• Fuel Quality: The quality of the diesel fuel used can significantly impact soot production.
• Engine Oil Quality: The type and quality of engine oil can also play a role.
• Driving Style and Journey Type: Diesel engines are not optimally designed for short journeys or stop-start driving. These conditions lead to increased particulate matter generation in the exhaust system, placing a greater burden on the DPF, EGR valve, and catalytic converter.

The core issue arises when the engine produces more particulate matter than the DPF can efficiently manage. This can manifest in symptoms such as engine hesitation or a noticeable loss of power. Ultimately, an engine warning light will illuminate, indicating an issue within the emission control system. If left unaddressed, the vehicle may enter a "limp home" mode, severely restricting power.

It is a common misconception that a severely clogged DPF necessitates replacement. This is often a lucrative upsell for some dealerships and garages. However, it is categorically true that a DPF can be cleaned, even if it is 100% saturated and the vehicle is barely running at idle, provided it has not suffered catastrophic failure. Modern cleaning techniques and technologies allow for thorough cleaning without the need for dismantling the DPF. Furthermore, even if the Engine Control Unit (ECU) prevents further regeneration cycles, cleaning can still be achieved with the assistance of diagnostic software.

It is crucial to understand that the particulate matter accumulating in the DPF is not solely derived from fuel and combustion. It is often a combination of these elements with engine oil. While some oil can enter the exhaust via the crankcase breather system, it more commonly bypasses the piston rings, leading to incomplete combustion and subsequent particulate formation. This is the reason for the development of mid-SAPS and low-SAPS engine oils, which are designed to have lower ash content, theoretically giving the DPF an easier life. However, in some instances, high ash content can damage the DPF if it cannot be combusted. Our experience suggests that higher ash oils may actually help prevent oil bypass in the first place, though this is a separate discussion.

Resolving a Blocked DPF

A frequent pitfall is misdiagnosis. An emission control warning light or a specific DPF warning light does not *always* indicate a blocked DPF. This is a far more common scenario than many realise. Do not automatically assume the DPF is the culprit if you see a DPF warning light.

For Example: Emission warning lights often encompass the entire emission control system. A fault with the Exhaust Gas Recirculation (EGR) valve, for instance, can be the root cause of what initially appears to be a DPF issue. One of the most prevalent faults involves the Pressure Differential Sensor, which calculates the saturation level and reports an over-saturation condition to the ECU. If this sensor is faulty, the DPF might be perfectly fine, but the sensor incorrectly reports excessive carbon build-up, preventing regeneration. These sensors should be among the first components checked, yet they are frequently overlooked. The outcome is a dissatisfied customer whose cleaning product or process seemingly "didn't work." In reality, it likely did, but the faulty sensor provided incorrect readings. The ECU identifies the pressure sensor as faulty, necessitating its replacement rather than DPF cleaning.

Secondly, and perhaps more critically, there must be an underlying reason for a DPF blockage if it is indeed blocked. These root causes should be identified and addressed accordingly.

For Example: Fuel system deposits leading to inefficient combustion can generate more carbonaceous matter than the DPF can handle. This also applies to low-quality or incorrectly specified engine oil. Is the engine consuming oil? Consider driving style and journey types. Specific conditions are required for the DPF to regenerate and manage carbon build-up. Continuous low RPMs, stop-start driving, and short journeys that prevent the engine and DPF from reaching full operating temperature will, over time, take their toll. Other underlying faults, such as an injector or EGR issue, can prevent DPF regeneration. The ECU recognises an underlying fault and "locks out" or prevents DPF regeneration cycles. As previously mentioned, a faulty pressure differential sensor may misread the back pressure levels between the front and rear of the DPF. For instance, if the saturation level is only 10%, but the sensor calculates 50%, the system effectively shuts down until the sensor is replaced. Therefore, it is essential to ascertain if a DPF blockage exists and, if so, to identify the root cause(s). Failure to do so will result in a futile effort.

This explains why fuel-based DPF cleaners and professional DPF cleaning services can yield inconsistent results. Many users fail to correctly diagnose and/or address the underlying issues. If a fuel-based DPF cleaner did not yield the expected results, it's probable that the actual fault is not directly DPF-related, or an underlying problem is creating a lose-lose situation. It is not always as straightforward as it may seem, but we aim to simplify the process.

Logical Steps to Resolving Suspected DPF Issues

Further Information:

In many instances, utilising a professional fuel system and carbon cleaner to ensure the fuel system and injectors operate without deposits can be more critical than using a dedicated DPF cleaner. A fuel system cleaner not only aids in cleaning the DPF but also eliminates one of the most common contributing factors – dirty injectors – which, if left unresolved, will lead to the DPF clogging again in short order. For this purpose, we recommend products like Oilsyn Diesel Dr and DPF & Turbo or Archoil AR6400-D MAX.

You can opt for a generic cleaner that relies on the engine's natural scavenging and cleaning mechanisms (as described in EGR cleaning articles), or you can use higher-end cleaners that incorporate molecules activated during the combustion process (catalysts). These molecules bond with hydrocarbons in the DPF, lowering the temperature threshold at which they combust. The Oilsyn DPF & Turbo Dr is among the best we have tested. It contains chemistry comprising carbon-removing molecules activated during combustion rather than destroyed, unlike most fuel additives. This type of DPF cleaner, combined with a spirited drive (or dropping a gear to increase RPMs) to generate more heat, helps clean the DPF far more effectively. In genuine DPF blockage cases, these cleaners demonstrate some of the highest success rates among tested DPF cleaning additives, successfully reducing saturation percentages, clearing engine warning lights, and enabling passive regeneration.

It is vital to remember that heat is essential for carbon removal. Therefore, using such a cleaner during short journeys will inhibit results. It must be combined with a longer drive and a driving style that allows the temperature within the DPF and the overall system to increase.

If passive regeneration is not restored and the cleaner is not working, it indicates that the DPF is oversaturated to a point where the ECU will not permit regeneration, the issue has been misdiagnosed, or another factor is restricting DPF regeneration. DPF regeneration could be locked out by the ECU, rendering the system inoperable. It is also possible for a vehicle to become so saturated that back pressure is severely restricted, leading to barely idling. In such scenarios, the DPF requires direct professional cleaning.

Professional Cleaning

Professional DPF cleaning typically involves a two-step process administered by a qualified technician. The first step involves spraying a cleaning agent directly into the DPF via the pressure sensor hose. This chemical bonds with the carbon, dissolving it and preparing it for the subsequent stage. The second step involves maintaining high engine revs for several minutes to burn off the carbon, followed by the application of a flushing solution through the same hose. This process effectively removes any residual cleaning agents and deposits.

We recommend locating a reputable garage in your area for this type of professional cleaning service.

Maintaining a Clean DPF

Once the DPF has been cleaned, it is equally important to ensure that particulate levels remain manageable. As previously mentioned, the use of a professional fuel system cleaner is vital for restoring efficiency to the fuel injectors. We also recommend an ongoing fuel additive with fuel catalyst or combustion modification technology, such as Oilsyn Diesel Power DNA or Archoil AR6900-D MAX. These additives reduce the production of hydrocarbons in the first place and lower the temperature threshold at which fuel combusts, even when the engine is cold. Consequently, you will produce fewer hydrocarbons from the moment the engine starts. This is particularly critical for vehicles used primarily for local trips (e.g., shopping or school runs). It significantly eases the burden on the DPF and reduces its tendency to become oversaturated in the future. We have received numerous reports from consumers and fleet owners indicating that their vehicles regenerate far less frequently when using Diesel Power DNA. The key is to maintain carbon production at a manageable level for the emission control system, and these types of additives are highly effective in achieving this.

Excessive Oil Contamination

If the engine consumes oil, unburnt oil can contaminate the DPF. During the next oil change, consider using a professional engine oil flush, such as Oilsyn ReleaseTech Power Flush, to restore lost compression. As deposits build up on the piston rings, they can push the rings away from the cylinder bore, allowing oil to bypass the rings and enter the combustion area. Once this occurs, the DPF must contend with an increased influx of particulates and further build-up.

Subsequently, use a high-quality engine oil and/or oil additive to maintain correct compression and prevent future deposit build-up. For this, we recommend any genuine synthetic oils (Group IV or better) and/or Oilsyn Velosyn or Archoil AR9200 V2. These products help keep the piston rings and bores clean, reducing the amount of oil entering the intake system. When combined with a fuel additive, there is no reason why the DPF cannot outlive the vehicle itself, without the need for dedicated DPF cleaning procedures (whether invasive or otherwise).

We hope this comprehensive guide has been helpful. If you require any further assistance, please do not hesitate to contact us.

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