MERCEDES 420 (1990)
Running costs, reliability data, and common problems from 125 real MOT tests.
Annual Cost
£2,907
£242/month
MOT Pass Rate
74%
Average
Road Tax
£760
Based on CC/year
Insurance
Grp 35-50
4196cc Petrol
Check Carefully
74% pass rate, £2907/year to run. 8 points below average.
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Annual Running Costs
~30 mpg
Based on 4196cc
Higher estimate due to low pass rate
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
Average reliability. Expect some repairs as it ages. That's 8 points below the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 36 years old, 74% of MERCEDES 420s from 1990 passed their MOT first time in 2026. That's based on 125 tests across the UK. The average mileage at this age is 131,208 miles.
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How Does It Compare?
Mileage Analysis
131,208
Average miles
266,400
Expected for age
The average 1990 MERCEDES 420 has 131,208 miles on the clock, which is significantly below the expected 266,400 miles for a 36-year-old car. Low-mileage examples may have spent time sitting unused, so check for issues like corroded brakes or perished rubber seals.
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About the 1990 MERCEDES 420
The 1990 MERCEDES 420 is a performance with a 4196cc petrol engine. 125 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It sits in the bottom 77% of 1990 cars for MOT pass rates.
With an average of 131,208 miles at 36 years old, MERCEDES 420 owners tend to use this car less than the typical driver. Very low mileage could mean the car has been garaged or used only for short trips, which can cause its own issues like battery drain and moisture buildup.
1990 MERCEDES 420 Fuel Costs
The 4196cc 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 1990 MERCEDES 420?
Total estimated annual running cost is £2,907 (£242/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 74% pass rate. Keeping on top of servicing will help avoid surprises.
Buying a Used 1990 MERCEDES 420
At 36 years old, the MERCEDES 420 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.
Common Issues to Watch For
Based on the 1990 MERCEDES 420's fuel type, age, and engine size, these are the most likely problem areas to check.
Timing Chain / Belt
Watch outAt 36 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
Watch outWith an average of 131k 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.
Engine Mounts
Medium riskWorn engine mounts cause excessive vibration and movement. Replacement costs £150-£400 per mount. Check for vibration at idle with the bonnet open.
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 1990 MERCEDES 420 stacks up against similar cars for annual running costs, insurance, and tax.
| Car | Pass Rate | Fuel/yr | Tax/yr | Insurance | Total/yr |
|---|---|---|---|---|---|
| MERCEDES 420(1990) | 74% | £1592 | £760 | Grp 35-50 | £2907 |
| JAGUAR XJS(1992) | 78% | £1592 | £250 | Grp 35-50 | £2397-£510 |
| LAND ROVER RANGE ROVER(1992) | 85% | £1592 | £250 | Grp 35-50 | £2247-£660 |
| TVR GRIFFITH(1992) | 88% | £1592 | £250 | Grp 35-50 | £2247-£660 |
| JAGUAR XJ(1992) | 82% | £1592 | £250 | Grp 35-50 | £2247-£660 |
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
JAGUAR XJS
1992 · 4000cc Petrol
LAND ROVER RANGE ROVER
1992 · 3950cc Petrol
TVR GRIFFITH
1992 · 3948cc Petrol
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