MERCEDES S500 L AMG LN PRM+EXC MHEV4M A (2023)
Running costs, reliability data, and common problems from 57 real MOT tests.
Annual Cost
£2,042
£170/month
MOT Pass Rate
95%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2999cc Hybrid
Great Choice
95% pass rate, £2042/year to run. 13 points above average.
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Annual Running Costs
~30 mpg
Flat rate (post-2017)
Low estimate due to excellent reliability
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.
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Reliability Verdict
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 2023 passed their MOT first time in 2026. That's based on 57 tests across the UK. The average mileage at this age is 11,741 miles.
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How Does It Compare?
Mileage Analysis
11,741
Average miles
22,200
Expected for age
The average 2023 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A has 11,741 miles on the clock, which is below the expected 22,200 miles for a 3-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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Best Year to Buy?
The most reliable year is the 2022 model with a 100% MOT pass rate, while the 2023 model has the lowest at 95%. Consider a different year if reliability is a priority.
MERCEDES S500 L AMG LN PRM+EXC MHEV4M A by Year
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About the 2023 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A
The 2023 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A is a large car with a 2999cc hybrid engine. 57 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. Among all cars from 2023, the average MOT pass rate is 95%, and this model falls short of that benchmark.
With an average of 11,741 miles at 3 years old, MERCEDES S500 L AMG LN PRM+EXC MHEV4M A owners tend to use this car less than the typical driver.
2023 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 2023 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A?
Total estimated annual running cost is £2,042 (£170/month), broken down as £1592 fuel, £195 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 2023 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. Note: with only 57 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2023 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A's fuel type, age, and engine size, these are the most likely problem areas to check.
Hybrid Battery Health
Low riskAfter 3 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.
Inverter and Power Electronics
Low riskThe inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.
Regenerative Braking
Low riskBrake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.
Service History
Low riskAlways request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.
Running Costs Compared
How the 2023 MERCEDES S500 L AMG LN PRM+EXC MHEV4M A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES S500 L AMG LN PRM+EXC MHEV4M A(2023) | 95% | £1592 | £195 | Grp 30-42 | £2042 |
| BMW X5 XDRIVE45E M SPORT AUTO(2021) | 88% | £1592 | £190 | Grp 30-42 | £2187+£145 |
| BMW M340I XDRIVE MHEV AUTO(2021) | 93% | £1592 | £190 | Grp 30-42 | £2037-£5 |
| LEXUS RX(2021) | 97% | £1592 | £190 | Grp 35-50 | £2037-£5 |
| BMW M440I XDRIVE MHEV AUTO(2021) | 92% | £1592 | £190 | Grp 30-42 | £2037-£5 |
Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.
Related Mercedes Models
Explore other Mercedes cars or similar models in the same category.
MERCEDES A
2019 · 1461cc Diesel
MERCEDES C
2017 · 1991cc Hybrid
MERCEDES A-CLASS
2017 · 1461cc Diesel
BMW X5 XDRIVE45E M SPORT AUTO
2021 · 2998cc Hybrid
BMW M340I XDRIVE MHEV AUTO
2021 · 2998cc Hybrid
LEXUS RX
2021 · 3456cc Hybrid
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