MERCEDES 500SL (2003)
Running costs, reliability data, and common problems from 32 real MOT tests.
Annual Cost
£2,757
£230/month
MOT Pass Rate
81%
Good
Road Tax
£760
Based on CC/year
Insurance
Grp 35-50
4966cc Petrol
Solid Option
81% pass rate, £2757/year to run. Close to the national average.
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Annual Running Costs
~30 mpg
Based on 4966cc
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
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 23 years old, 81% of MERCEDES 500SLs from 2003 passed their MOT first time in 2026. That's based on 32 tests across the UK. The average mileage at this age is 85,782 miles.
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Mileage Analysis
85,782
Average miles
170,200
Expected for age
The average 2003 MERCEDES 500SL has 85,782 miles on the clock, which is below the expected 170,200 miles for a 23-year-old car. This suggests lighter use than average, which generally means less wear on major components.
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About the 2003 MERCEDES 500SL
The 2003 MERCEDES 500SL is a performance with a 4966cc petrol engine. 32 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 22% of all 2003 cars for reliability.
With an average of 85,782 miles at 23 years old, MERCEDES 500SL owners tend to use this car less than the typical driver.
2003 MERCEDES 500SL Fuel Costs
The 4966cc petrol 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 petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2003 MERCEDES 500SL?
Total estimated annual running cost is £2,757 (£230/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 81% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 2003 MERCEDES 500SL
At 23 years old, the MERCEDES 500SL is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. Note: with only 32 tests in our data, these figures should be treated as indicative rather than definitive.
Common Issues to Watch For
Based on the 2003 MERCEDES 500SL's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 23 years old, check whether the timing belt has been replaced (typically due every 5-7 years or 60,000-100,000 miles). A snapped belt can destroy the engine.
Oil Consumption
Medium riskLarger petrol engines can develop higher oil consumption as they age. Check the oil level and look for blue smoke from the exhaust.
Rust and Corrosion
Watch outAt 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.
Suspension Bushings
Watch outRubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.
Clutch Wear
Medium riskWith an average of 86k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.
Brake Discs and Pads
Medium riskHigh-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.
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 2003 MERCEDES 500SL stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES 500SL(2003) | 81% | £1592 | £760 | Grp 35-50 | £2757 |
| BMW X5(2005) | 77% | £1592 | £250 | Grp 35-50 | £2397-£360 |
| MERCEDES CLK(2004) | 76% | £1592 | £250 | Grp 35-50 | £2397-£360 |
| MERCEDES SL(2003) | 86% | £1592 | £250 | Grp 35-50 | £2247-£510 |
| ROVER 75(2004) | 69% | £1592 | £250 | Grp 35-50 | £2597-£160 |
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
2005 · 4799cc Petrol
MERCEDES CLK
2004 · 4966cc Petrol
MERCEDES SL
2003 · 4966cc Petrol
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