MERCEDES S500 L AMG LN PRM+EXC MHEV4M A (2021)
Running costs, common problems, and reliability data based on 186 real MOT tests in 2024.
MOT Pass Rate
95%
Total Tests (2024)
186
Avg Mileage
30,133 mi
Est. Annual Cost
£2,037
Is the 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A reliable?
Excellent reliability. Very few MOT failures. That's 13 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 3 years old, 95% of MERCEDES S500 L AMG LN PRM+EXC MHEV4M As from 2021 passed their MOT first time in 2024. That's based on 186 tests across the UK. The average mileage at this age is 30,133 miles.
How does the 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A compare?
Mileage Analysis
The average 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A has 30,133 miles on the clock, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
Best year to buy a MERCEDES S500 L AMG LN PRM+EXC MHEV4M A?
The most reliable year is the 2022 model with a 100% MOT pass rate, while the 2023 model has the lowest at 95%. The 2021 sits between the two at 95%.
How much does a 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES S500 L AMG LN PRM+EXC MHEV4M A by Year
Checking a specific MERCEDES S500 L AMG LN PRM+EXC MHEV4M A?
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About the 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A
The 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A is a large car with a 2999cc hybrid engine. 186 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It ranks in the top 7% of all 2021 cars for reliability.
With an average of 30,133 miles at 3 years old, MERCEDES S500 L AMG LN PRM+EXC MHEV4M A owners cover more miles than the average driver.
2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A Fuel Costs
The 2999cc hybrid engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 per year at current hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.
What does it cost to own a 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A?
Total estimated annual running cost is £2,037 (£170/month), broken down as £1592 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 95% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES S500 L AMG LN PRM+EXC MHEV4M A Reliability Trend
The MERCEDES S500 L AMG LN PRM+EXC MHEV4M A has maintained consistent MOT pass rates across model years, varying by only 3 percentage points.
Buying a Used 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. If you're flexible on year, the 2022 model has the highest pass rate at 100%.
Alternatives to the 2021 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A
If reliability is your priority, there's one similar car with a higher MOT pass rate. Here are comparable hybrid cars with similar engines:
- TOYOTA RAV4 (2020) 95% pass rate (same) from 21,063 tests
- BMW X5 XDRIVE45E M SPORT AUTO (2021) 88% pass rate (-7%) from 7,560 tests
- BMW M340I XDRIVE MHEV AUTO (2021) 93% pass rate (-2%) from 4,809 tests
- LEXUS RX (2019) 96% pass rate (+1%) from 4,047 tests