MERCEDES S 400 L AMG LN PRM+EXEC D 4M A (2022)
Running costs, reliability data, and common problems from 41 real MOT tests.
Annual Cost
£1,695
£141/month
MOT Pass Rate
100%
Excellent
Road Tax
£195
Flat rate/year
Insurance
Grp 30-42
2925cc Diesel
Great Choice
100% pass rate, £1695/year to run. 18 points above average.
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Annual Running Costs
~40 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 18 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 4 years old, 100% of MERCEDES S 400 L AMG LN PRM+EXEC D 4M As from 2022 passed their MOT first time in 2026. That's based on 41 tests across the UK. The average mileage at this age is 67,956 miles.
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How Does It Compare?
Mileage Analysis
67,956
Average miles
29,600
Expected for age
The average 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A has 67,956 miles on the clock, which is well above the expected 29,600 miles for a 4-year-old car. Check service history carefully, as high-mileage cars need consistent maintenance to stay reliable.
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About the 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A
The 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A is a large car with a 2925cc diesel engine. 41 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 6% of all 2022 cars for reliability.
With an average of 67,956 miles at 4 years old, MERCEDES S 400 L AMG LN PRM+EXEC D 4M A owners cover more miles than the average driver. High-mileage examples should be checked carefully for wear on suspension, brakes, and drivetrain components.
2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A Fuel Costs
The 2925cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year).
What does it cost to own a 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A?
Total estimated annual running cost is £1,695 (£141/month), broken down as £1245 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 100% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
Buying a Used 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A
At 4 years old, the MERCEDES S 400 L AMG LN PRM+EXEC D 4M A offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. Note: with only 41 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A's fuel type, age, and engine size, these are the most likely problem areas to check.
DPF (Diesel Particulate Filter)
Medium riskShort journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.
Turbo Wear
Medium riskDiesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.
AdBlue System
Medium riskPost-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.
EGR Valve
Low riskExhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.
Dual Mass Flywheel
Medium riskLarger diesel engines put extra strain on the dual mass flywheel. Listen for rattling at idle. Replacement with clutch is £800-£1,500.
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 2022 MERCEDES S 400 L AMG LN PRM+EXEC D 4M A stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES S 400 L AMG LN PRM+EXEC D 4M A(2022) | 100% | £1245 | £195 | Grp 30-42 | £1695 |
| BMW X5(2020) | 93% | £1245 | £190 | Grp 30-42 | £1690-£5 |
| TOYOTA HILUX INVINCIB X D-4D4WD DCB A(2021) | 94% | £1245 | £190 | Grp 30-42 | £1690-£5 |
| MITSUBISHI L200(2020) | 91% | £1245 | £190 | Grp 25-38 | £1690-£5 |
| LAND ROVER DISCOVERY HSE SD6 AUTO(2020) | 91% | £1245 | £190 | Grp 30-42 | £1690-£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
2020 · 2993cc Diesel
TOYOTA HILUX INVINCIB X D-4D4WD DCB A
2021 · 2755cc Diesel
MITSUBISHI L200
2020 · 2442cc Diesel
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