BMW M135i Oil Change Guide

When it comes to maintaining the performance and longevity of your BMW M135i, a regular and correct oil change is paramount. This high-performance hatchback, known for its exhilarating driving experience, relies heavily on clean and properly circulated engine oil to keep its potent engine running at its peak. This guide will explore the best options for getting an oil change for your M135i, with a particular focus on the UK market, and delve into crucial aspects of oil level checks to ensure your beloved Beemer stays in top condition.

Where to Get Your BMW M135i Oil Change

For BMW M135i owners in the UK, finding a reliable place for an oil change is straightforward. While you could technically visit a BMW dealership, it's often more cost-effective to explore specialist independent garages or reputable auto parts retailers with fitting services. One highly recommended option for readily available parts and often fitting services is Euro Car Parts. They stock a wide range of high-quality engine oils and filters specifically designed for BMW vehicles, including the M135i. Many of their branches also offer a fitting service, making it a convenient one-stop shop.

Alternatively, consider independent BMW specialists. These garages often have technicians with in-depth knowledge of BMW engines and can provide a more personalised service. They are also likely to use premium quality parts and oils, ensuring your M135i receives the best care. When choosing an independent specialist, look for those with good reviews and a reputation for quality workmanship. Always ensure they are using the correct grade and specification of oil as recommended by BMW for your M135i model.

Understanding Oil Specifications for the M135i

The BMW M135i, depending on the specific model year and engine variant (such as the N55 or B58 engine), will have specific oil requirements. It's crucial to use an engine oil that meets BMW's stringent Longlife specifications, typically BMW LL-01 or BMW LL-04 for diesel variants. These specifications ensure the oil provides optimal protection, cleanliness, and performance under the demanding conditions of a turbocharged engine like the one in the M135i. Always consult your owner's manual or a trusted mechanic to confirm the exact oil specification required for your vehicle.

Using the wrong type of oil can lead to premature engine wear, reduced performance, and potentially costly damage. Factors like viscosity grade (e.g., 5W-30, 0W-40) are also critical and should be chosen based on the manufacturer's recommendations and your typical driving conditions.

The Importance of Accurate Oil Level Checks

As highlighted by a common owner experience, performing an oil level check on 100% level ground is absolutely critical for an accurate reading. Modern BMWs, including the M135i, often feature sophisticated electronic oil level sensors. These sensors can be sensitive to the angle of the vehicle. If the car is parked on a slope, even a slight incline, the sensor may provide a false reading, indicating the oil level is lower or higher than it actually is.

The experience of a user needing to top up after only 1500 miles, only to find it perfect after a top-up and subsequent driving on level ground, is a prime example of this sensitivity. This can lead to unnecessary oil purchases and potentially overfilling if not carefully managed. Always ensure your vehicle is parked on a flat surface for at least a few minutes before checking the oil level, whether you're using the electronic display in the cabin or a traditional dipstick (if fitted).

When to Check Your Oil Level

It's good practice to check your oil level regularly. BMWs typically have an electronic oil level monitoring system accessible through the iDrive system. This system will usually alert you when a check is recommended or when the oil level is getting low. However, it's still advisable to perform manual checks periodically, especially before long journeys or if you notice any unusual engine noises or performance changes. Aim to check your oil level at least once a month.

How to Check Your Oil Level (Electronic System)

1. Park on Level Ground: As stressed before, this is the most crucial step.

2. Warm Up the Engine: For the most accurate reading from the electronic sensor, the engine oil should be at its normal operating temperature. Drive the car for about 10-15 minutes.

3. Turn Off the Engine: Switch off the ignition and wait for a few minutes (usually around 5-10 minutes) to allow the oil to settle back into the sump.

4. Access the Menu: Navigate through the iDrive system. The exact path can vary slightly depending on the iDrive version, but it's typically found under 'Vehicle Info' or 'Service Info' and then 'Engine Oil Level'.

5. Initiate the Measurement: Select the option to measure the oil level. The system will then display the current oil level, usually as a minimum and maximum mark or a numerical value.

What to Do if the Oil Level is Low

If the electronic system indicates that the oil level is low, and you've confirmed this by checking on level ground, you'll need to top up. It's best to use the specific BMW-approved oil for your M135i. If you're unsure, consult your owner's manual or a reputable garage. When topping up, add oil in small increments (e.g., 250ml at a time), re-checking the level after each addition until it reaches the maximum mark. Never overfill the engine, as this can be just as detrimental as having too little oil.

DIY Oil Change: Is it Worth It?

While many owners opt for professional services, a DIY oil change is certainly achievable for the mechanically inclined. You'll need the correct oil, a new oil filter, an oil filter housing/wrench, a drain plug crush washer, a drain pan, and basic hand tools. The process typically involves draining the old oil, replacing the oil filter, and refilling with fresh oil. However, it's essential to dispose of the old oil responsibly.

For the M135i, especially if it's still under warranty, ensure that any DIY maintenance is carried out correctly to avoid voiding it. If you're not confident in your abilities or lack the necessary tools, entrusting the job to a professional is the safer bet.

Factors to Consider for Your Next Oil Change

When deciding on your next oil change, consider the following:

• Mileage Intervals: Follow BMW's recommended service intervals, typically indicated by the car's Condition Based Servicing (CBS) system.
• Driving Style: If you frequently drive your M135i hard, or in stop-start traffic and extreme weather conditions, you might consider shortening the oil change intervals for increased protection.
• Oil Quality: Always opt for high-quality synthetic oil that meets BMW's specifications. It offers superior protection and performance.
• Filter Quality: Use a reputable oil filter to ensure effective filtration of contaminants.

Troubleshooting Common Oil-Related Issues

Q: My M135i is constantly asking for oil top-ups. What could be wrong?

A: This can be due to several factors. Firstly, ensure you are checking the oil level on a perfectly level surface. If the car is on a slight incline, the sensor can give false readings. Secondly, some oil consumption is normal for high-performance engines, especially if driven hard. However, excessive consumption could indicate worn piston rings or valve stem seals. If you're topping up frequently and the level still drops rapidly, it's best to have it inspected by a qualified mechanic.

Q: How much oil does my M135i typically take?

A: The exact oil capacity varies slightly depending on the specific engine (N55 or B58) and model year. Generally, the M135i requires around 6.5 to 7 litres of engine oil. Always refer to your owner's manual for the precise capacity and check the level after refilling.

Q: Is it okay to mix different brands of oil?

A: While it's generally not recommended to mix different brands or types of oil, if you absolutely must top up and can't get the exact same oil, ensure that the oil you use meets the same BMW specifications (e.g., LL-01). However, it's best practice to flush and refill with a single, correct type of oil at the next service.

In conclusion, keeping your BMW M135i’s engine healthy starts with regular, correct oil changes and diligent oil level monitoring. Whether you choose Euro Car Parts, an independent specialist, or decide to tackle it yourself, ensuring the right oil and accurate checks are performed will contribute significantly to the longevity and performance of your cherished M135i.