Are Mercedes Reliable Cars? 8 Reliability FAQs Answered!

Are Mercedes reliable cars? Generally speaking, Mercedes-Benz delivers strong performance and premium comfort, but its reliability is not rated as high as rivals like Lexus or Toyota.

This blog covers everything you need to know about Mercedes’ reliability in the UK. From common faults to maintenance costs, and the most and least reliable models, we’ll answer the 8 most frequently asked questions to help you make an informed decision.

Let’s get started!

1. Are Mercedes Reliable Cars in 2025?

According to the 2025 What Car Reliability Survey, Mercedes ranks 22nd out of 31 manufacturers with a reliability score of 89.7%. This places Mercedes behind top brands like Lexus and Toyota but ahead of some German rivals. 

Mercedes dealership data shows around 195 repairs per 100 Mercedes vehicles sold in the first three years. By comparison, Audi and Jaguar have higher repair rates, at 232 and 233 per 100 vehicles, respectively.

Still, reliability varies across Mercedes models. Some are very solid, while others have known issues. So, it’s important to research before you buy. This helps avoid surprises and lets you know what to expect. 

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2. Are Mercedes Cars Reliable After 100k Miles? 

Yes, Mercedes-Benz vehicles can be reliable even after 100,000 miles, as long as they have been well-maintained. New Mercedes cars come with a four-year or 50,000-mile warranty covering the powertrain and major parts. You can also buy an extended warranty for up to three more years to cover extra repairs and upkeep.

For electrified models like those in the Mercedes-EQ range, battery warranties last six years or 62,000 miles. In some states, this extends up to ten years or 150,000 miles. That said, after 100,000 miles, repairs may become more frequent and maintenance costs higher. Common wear items such as brakes, suspension, and electrical systems will need attention.

However, with proper maintenance, many Mercedes models can go beyond 200,000 miles, making them a reliable choice in the long run.

3. What are the Most Reliable Mercedes Cars?

Many people wonder are Mercedes A Class reliable? Some want to know are Mercedes GLA reliable? Let’s put these questions to rest and list down the most reliable Mercedes cars in the UK for 2025.

i. Mercedes E-Class

The E-Class continues to be one of Mercedes’ most trusted models. In the latest What Car reliability survey, it scored an impressive 92.7%. Honest John gives it a strong 4 out of 5 rating. It’s been around for generations and remains central to Mercedes’ lineup. 

The E-Class combines executive comfort, solid build quality, and refined performance into one dependable package. It’s no surprise that many owners keep them well past 100,000 miles. With good maintenance, the E-Class proves itself reliable and cost-effective.

ii. Mercedes S-Class (2024 onward)

Are Mercedes S Class reliable in the UK? Well, the S-Class is often called the best car Mercedes makes. Honest John gives it a full 5 out of 5 for owner satisfaction.

Ranked second among top Mercedes models, it stands out for luxury. The interior is packed with cutting-edge tech, and the ride quality is as smooth as it gets. 

It won’t be too far-fetched to say that driving an S-Class feels more like flying first class. While it may come at a premium, its long-term reliability and high customer ratings make it a strong option for those who want comfort and peace of mind in equal measure.

iii. Mercedes GLC-Class

The GLC-Class is one of the most reliable Mercedes and earns high praise for practicality and performance. Honest John gives it a solid 5 out of 5. The latest version brings more space, better refinement, and top-level tech, especially in the plug-in hybrid variants.

It’s a great all-rounder, offering a blend of comfort, efficiency, and family-friendly design. While it doesn’t quite beat its rivals on road performance, it delivers enough to satisfy most.

Prices have gone up compared to the older model, but with strong owner reviews and dependable build quality, the GLC remains one of the more reliable luxury medium SUVs you can buy in the UK.

4. What are the Least Reliable Mercedes Cars?

While Mercedes has a strong reputation overall, not all models have aged equally well. Some versions have been flagged for recurring problems, especially older or pre-facelift models.

i. Mercedes GLE (pre-2020)

Earlier versions of the GLE, especially those built before 2020, have had their fair share of issues. Owners reported faults with the infotainment system, random electrical glitches, and problems with the suspension. Particularly, air suspension failures were costly to fix. 

Moreover, repairs can cost thousands of dollars, depending on what fails, because Mercedes parts and service aren’t cheap. If you’re considering a used GLE, it’s wise to check for a full service history and ensure common issues have already been addressed.

ii. Mercedes A-Class (early 2010s)

The Mercedes A-Class is not the most reliable car, especially its earlier models from the early 2010s. These had a few known trouble spots. Diesel variants were known for DSG gearbox concerns and software-related issues, causing jerky shifting or unresponsive acceleration. 

On top of that, many owners also reported issues with sensors and engine lights. While newer A-Class models are much improved, the earlier ones are best approached with caution unless you’re buying from a reputable source with solid warranties.

iii. Mercedes S-Class (2007–2013)

Although the S-Class is known for luxury, models from 2007 to 2013 came with a few expensive headaches. The main issue was the complex air suspension system, which often failed and could cost upwards of £2,000 to repair. 

These models were also packed with early-generation electronics that, over time, have proven troublesome. Troubles range from faulty control units to sensor malfunctions.

As a result, older S-Class cars can rack up high maintenance bills if they haven’t been meticulously cared for.

5. Are Mercedes Cars Expensive to Maintain?

Yes, Mercedes-Benz vehicles are generally more expensive to maintain than other car brands in the UK, because of their premium build and features.

According to Nationwide Vehicle Contracts, UK owners usually spend between £450 and £800 a year on maintenance, depending on the model and how much it’s driven.

And Fleet News estimates running costs at about 5.7 p per mile, which can add up quickly for high-mileage drivers. When it comes to servicing, Mercedes-Benz UK recommends routine checks, such as oil changes and brake inspections, every 10,000 to 20,000 miles.

Basic services typically range from £120 to £300. However, major repairs can be costly. Similarly, engine repairs may exceed £1,000, while gearbox fixes can top £2,100.

Given these figures, it’s sensible for UK Mercedes owners to budget around £700 annually for maintenance. This helps avoid surprises and keeps the vehicle running smoothly.

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6. What are Common Mercedes Issues to Watch For?

Mercedes-Benz vehicles are well-built and luxurious, but like any car brand, they do have some recurring issues. To begin with, electrical faults are one of the most common problems reported in the UK.  These include faulty sensors, glitchy infotainment systems, and unexplained warning lights, particularly in models like the CLA (2019–2025).

In addition, diesel models can suffer from Diesel Particulate Filter (DPF) issues, which can be expensive to fix. And transmission troubles, such as rough gear shifts or occasional failures, have been noted across several models.

Another concern is the wear and tear of hydraulic engine mounts, which can cause vibrations and extra noise. Meanwhile, older or high-mileage vehicles may experience air suspension problems and brake hose leaks.

Lastly, power windows and touchscreens may become unresponsive. However, with regular maintenance and prompt repairs, these issues can often be avoided or kept under control.

7. How Does Mercedes Reliability Compare to Other Brands in the UK?

In the UK, Mercedes-Benz ranks solidly but not at the very top for reliability. As mentioned earlier, according to the 2024 What Car Reliability Survey, Mercedes sits 22nd out of 32 brands with an 89.7% reliability rating for cars up to five years old.

This places it behind leaders like Mini (98.3%), Lexus (97.9%), and Toyota (96.1%), but ahead of Audi (89.0%) and Land Rover (87.1%).

Mercedes models tend to have a moderate fault rate of around 47%. For some variants like the 2017-2023 E-Class, the brand excels in customer service, with 91% of repairs covered by the manufacturer and most faults fixed within a week.

In owner satisfaction surveys such as Auto Express’s Driver Power, Mercedes models like the GLE rank highly for reliability. It scores 94.56%, placing it among the UK’s most dependable luxury SUVs. Overall, Mercedes offers dependable performance typical of a premium German marque. But with slightly more frequent repairs than Japanese rivals, reflecting the complexity of its advanced technology and luxury features.

8. Should You Buy a Used Mercedes Car?

Buying a used Mercedes in the UK can be a rewarding decision, but it’s important to approach it carefully. Some models perform better than others.

For instance, the Mercedes CLA scored an impressive 96.2% on the What Car Survey and earned praise for reliability and dealer service. Though some owners reported electrical faults and minor transmission issues.

Meanwhile, models like the E-Class and GLE are some of the more comfortable cars in the UK. But they come with more frequent repair needs. The GLE, for example, scored 88.2% reliability, with 35% of owners experiencing mostly electrical problems.

On the other hand, older models like the S-Class are known for excellent long-term durability when properly maintained. To stay on the safe side, always ask for a full service history, arrange a professional inspection, and consider an extended warranty.

Final Thoughts: Are Mercedes Reliable Cars?

Mercedes cars deliver luxury, comfort, and prestige, making them a favourite for many UK drivers. While some Mercedes models are impressively reliable, others may require more attention and higher running costs.

With proper care and regular servicing, a well-chosen Mercedes can easily offer a smooth, enjoyable drive for years. Before buying, research the model’s track record, check for a full service history, and consider setting aside a maintenance budget. This helps you avoid surprises and enjoy a reliable Mercedes experience.

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