Smart Car Servicing: Petrol vs. Electric Costs Unpacked

Owning a car, whether it’s a compact city runner like a Smart or a larger vehicle, comes with the essential responsibility of regular maintenance. Servicing is crucial for ensuring your vehicle's longevity, safety, and optimal performance. However, with the rise of electric vehicles (EVs), many assume that their simpler mechanical makeup translates to significantly lower servicing costs. For Smart electric drive (EQ) owners, this assumption often leads to a rather startling discovery: their service bills can be surprisingly higher than those for their petrol-powered counterparts.

This article aims to unravel the complexities of Smart car servicing, comparing the schedules and costs for both petrol and electric drive models. We'll explore what each service entails, highlight the key differences, and address the perplexing question of why an EV with fewer traditional components might still command a premium for maintenance. Understanding these nuances is vital for any Smart owner looking to manage their vehicle's upkeep effectively.

Servicing Your Petrol-Powered Smart Car

Traditional petrol cars, including the Smart Fortwo and Forfour with their turbo and non-turbo engines, require a range of checks and component replacements due to their internal combustion engines. Smart typically outlines two main service types: the 'A Service' (1 Spanner) and the 'B Service' (2 Spanners), which alternate annually or based on mileage.

A Service (The Essentials)

The A Service is generally a lighter check-up, focusing on immediate operational necessities. It’s designed to ensure the car is running smoothly and safely between more comprehensive services. Key items include:

• Replacing the cabin filter, crucial for air quality inside the vehicle.
• Replacing the engine air filter (for turbo models only), which ensures the engine breathes clean air.
• Changing the engine oil and oil filter, vital for engine lubrication and preventing wear.
• Checking and correcting all tyre pressures, essential for safety, fuel economy, and tyre longevity.
• Checking all exterior lights for proper operation, ensuring visibility and compliance.
• Checking the operation of headlight range adjusters.
• Checking and filling the windscreen washer tank.
• Checking speedo lighting and warning lights function correctly.
• Checking the emergency tyre sealant for expiry.
• Checking the first aid kit for expiration.

B Service (The Comprehensive Check)

The B Service is more thorough, delving deeper into the vehicle's mechanical and safety systems. It includes all items from the A Service plus additional critical inspections and replacements:

• Performing a brake test to assess braking efficiency.
• Checking all visible engine parts for damage and leaks.
• Replacing the engine air filter (for all petrol models).
• Checking steering and tie rods for wear and proper alignment.
• Checking the front axle and ball joints.
• Assessing the condition of the rear axle.
• Checking the condition of suspension springs and shock absorbers.
• Checking belts for visible signs of wear.
• Checking tyre condition for cracks and damage.

Scheduled Replacements and Checks for Petrol Models

Beyond the A and B services, certain components have specific time or mileage-based replacement intervals:

• Headlight Adjustment & Brake Fluid: Checked and corrected, and brake fluid replaced, first time after 3 years, then every 2 years. Brake fluid is hygroscopic, meaning it absorbs moisture, which degrades its performance over time.
• Underbody & Rear Brake Shoes: Checked at 50,000 miles, then every B Service thereafter. This helps identify any damage or leaks from road debris or corrosion.
• Spark Plugs: Changed every 50,000 miles. Spark plugs are critical for ignition and their condition directly impacts engine performance and fuel efficiency.
• Coolant: Replaced every 75,000 miles or 6 years. Coolant prevents the engine from overheating and freezing.

Transmission Fluid & Timing Chain

Interestingly, Smart does not provide a specific service interval for transmission fluid replacement, despite original claims that it would never need changing. Many experts, however, recommend replacing transmission fluid every 60,000 miles to ensure the gearbox operates smoothly and to extend its lifespan. Similarly, there's no fixed schedule for timing chain replacement. Timing chains “stretch” over time rather than snapping like belts, so replacement is typically performed when signs of looseness or rattling are observed.

Belts

Smart also doesn't have a specific schedule for belt changes (e.g., auxiliary belts). Instead, they are visually inspected at every service and replaced as soon as they show signs of wear, such as cracking or fraying.

Servicing Your Smart Electric Drive (EQ)

Here's where the plot thickens. Many would logically assume that an electric vehicle, lacking an internal combustion engine, oil changes, spark plugs, and various filters, would be significantly cheaper to service. However, Smart's approach to servicing their electric drive (EQ) models has raised eyebrows among owners.

While it's true that the EQ models eliminate the need for oil changes, oil filters, engine air filters, spark plugs, V-belts, and valve adjustments, the quoted service costs can often be higher than for their petrol counterparts. Initially, Smart suggested EV servicing would be under £100, but real-world quotes have been reported to be around £270 for a single service in the UK. A Smart service plan can reduce this to about £156 per service, which is still substantial considering the perceived simplicity.

What Needs Servicing in an Electric Smart?

Despite the absence of traditional engine components, electric vehicles have their own unique maintenance requirements, primarily centred around the electrical system, battery, and cooling. The Smart EQ service schedule is mileage or time-based, typically alternating between minor and major checks.

Key components and checks for the Smart EQ include:

• Cabin Pollen Filter: Replaced annually, just like in petrol cars, to maintain cabin air quality.
• Key Battery: Replaced annually.
• Brake Fluid Change: Required every two years. Although EVs use regenerative braking, which reduces wear on physical brakes, the brake fluid still degrades over time.
• Battery Desiccant Cartridge Change: Required every two years. This cartridge helps manage moisture within the high-voltage battery system, crucial for battery health and longevity.
• Washer Fluid Replenishment: Standard check.
• Check Motor & Transmission for Damage & Defective Mounts: Essential for the electric drivetrain's integrity.
• Check All High Voltage Lines: A critical safety check to ensure there's no damage or degradation to the high-voltage cabling.
• Check High Voltage Battery: This is arguably the most crucial and specialised check. It involves diagnostic tools to assess the battery's health, capacity, and overall performance.
• Coolant Level: EVs also have cooling systems, primarily for the battery and power electronics, which need their coolant levels checked.
• Tyre Pressures & Brake Pads/Shoes: Standard checks for safety and wear.

The High-Voltage Battery: Ownership vs. Rental

A significant factor influencing Smart EQ servicing, particularly in the past, was the high-voltage (HV) battery ownership model. Originally, some Smart EQ models were sold with the option to rent the battery separately from the car. If you own the battery outright, you have more flexibility regarding where and how your car is serviced. However, if you are still renting the battery, it is absolutely crucial to review your rental agreement documentation. Many agreements contain clauses that mandate servicing at a Smart dealership to maintain the warranty implications on the HV battery.

If you are currently renting, it's highly advisable to contact Smart to inquire about buying the battery outright. The full purchase option was announced in 2017 and typically provides a set guarantee for the battery, removing the servicing restrictions tied to rental agreements.

Why the Discrepancy in Service Costs?

The core question remains: why does a Smart electric drive, with fewer traditional 'wear and tear' components, often cost more to service than a petrol model? Several factors contribute to this perplexing situation:

1. Specialised Knowledge and Equipment: While EVs have fewer mechanical parts, the components they do have are often more complex and require specialised diagnostic equipment (like MB Star Diagnostics for Smart) and highly trained technicians. High-voltage systems demand specific safety protocols and expertise that not all independent garages possess.
2. High-Voltage Battery Checks: The HV battery check is a sophisticated procedure that goes beyond simple visual inspection. It involves connecting the vehicle to diagnostic software to analyse cell health, charging cycles, degradation, and overall performance. This is a time-consuming and expertise-intensive process.
3. Software Updates: EVs are heavily reliant on software. Dealerships often perform software updates during services, which can address bugs, improve efficiency, or enhance features. These updates are typically exclusive to authorised service centres.
4. Dealer Profit Margins: It's plausible that dealerships, accustomed to the profit margins from traditional petrol car services (oil changes, filter replacements, etc.), are attempting to compensate for the absence of these revenue streams in EV servicing. This could lead to a 'markup' on the more limited service items.
5. Lower Volume: While EVs are growing in popularity, the sheer volume of petrol cars still serviced means that costs for those services can be more competitive. With fewer Smart EQs on the road, the cost per service might be higher to cover overheads.
6. Battery Desiccant Cartridge: This is a unique component to EVs, requiring regular replacement to protect the battery from moisture. While it's a relatively small part, it adds to the specific EV service requirements.

DIY Servicing for Your Smart EQ

For the mechanically inclined, a significant portion of the Smart EQ service items can be managed at home, potentially saving considerable costs. You can easily perform tasks such as:

• Replacing the cabin pollen filter.
• Changing the key battery.
• Topping up washer fluid.
• Checking and correcting tyre pressures.
• Visually inspecting brake pads and shoes (though replacement might require more expertise).
• Basic visual checks of the motor and transmission for obvious damage or loose mounts.
• Checking coolant levels (for the battery/electronics cooling system).

However, there are critical elements that require specialist tools and expertise, primarily the high-voltage battery check and any software updates. If you have access to Mercedes-Benz Star Diagnostics, you might be able to perform the HV battery test yourself, but software updates generally remain dealership-exclusive.

Frequently Asked Questions (FAQs)

Q1: Is it true that electric Smart cars cost more to service than petrol ones?

Yes, surprisingly, reports from Smart EQ owners in the UK indicate that regular service costs can be higher than for comparable petrol models, despite the absence of engine oil changes, spark plugs, and other traditional combustion engine components. This is often attributed to the need for specialised diagnostic tools, high-voltage system checks, and potential dealership pricing strategies.

Q2: What is a 'Battery Desiccant Cartridge' and why does it need changing?

A battery desiccant cartridge is a component within the high-voltage battery system of an EV designed to absorb moisture. Moisture can be detrimental to the battery's performance and lifespan. Replacing this cartridge every two years ensures the battery environment remains dry and optimal, protecting this critical and expensive component.

Q3: Can I service my electric Smart car myself to save money?

Many basic checks and replacements like the cabin filter, key battery, washer fluid, and tyre pressure adjustments can be done by the owner. However, crucial high-voltage battery diagnostics and essential software updates require specialised equipment and trained technicians, typically found at authorised Smart dealerships. Attempting to service high-voltage components without proper training and tools can be extremely dangerous.

Q4: Does my battery rental agreement affect where I can service my Smart EQ?

Potentially, yes. If you are renting the high-voltage battery, your rental agreement may contain clauses that mandate servicing at an authorised Smart dealership to maintain the battery's warranty. It's vital to check your specific documentation. Consider contacting Smart to explore buying the battery outright to gain more flexibility and potentially avoid such restrictions.

Q5: How often should I service my Smart EQ?

Smart recommends servicing your EQ model annually or every 20,000 km (12,000 miles), whichever comes first. Key items like brake fluid and the battery desiccant cartridge are typically replaced every two years as part of this schedule.

Conclusion

The notion that electric vehicles are inherently cheaper to maintain, while true in some aspects due to fewer moving parts, doesn't always translate to lower service bills at authorised dealerships, particularly for Smart EQ models. While petrol Smart cars have a more traditional and predictable service schedule involving engine-related components, the electric drive models introduce new complexities related to high-voltage systems and sophisticated diagnostics.

Understanding the specific requirements for your Smart model, whether petrol or electric, is key to managing its cost-effectiveness over its lifespan. For electric Smart owners, being aware of the potentially higher service charges, the importance of the high-voltage battery check, and the implications of battery rental agreements is crucial. While some basic maintenance can be performed at home, critical checks and software updates often necessitate a trip to the dealership to ensure safety, warranty compliance, and the long-term health of your vehicle's most vital components. Ultimately, preventative maintenance remains the bedrock of reliable car ownership, regardless of what powers your Smart.

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