MERCEDES 312 (1997)
Running costs, common problems, and reliability data based on 89 real MOT tests in 2024.
MOT Pass Rate
63%
Total Tests (2024)
89
Avg Mileage
148,765 mi
Est. Annual Cost
£2,250
Is the 1997 MERCEDES 312 reliable?
Below average reliability. Budget extra for maintenance and repairs. That's 19 points below the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 27 years old, 63% of MERCEDES 312s from 1997 passed their MOT first time in 2024. That's based on 89 tests across the UK. The average mileage at this age is 148,765 miles.
How does the 1997 MERCEDES 312 compare?
Mileage Analysis
The average 1997 MERCEDES 312 has 148,765 miles on the clock, which is below the expected 199,800 miles for a 27-year-old car. This suggests lighter use than average, which generally means less wear on major components.
Best year to buy a MERCEDES 312?
The most reliable year is the 1996 model with a 84% MOT pass rate, while the 1997 model has the lowest at 63%. Consider a different year if reliability is a priority.
How much does a 1997 MERCEDES 312 cost to run?
Higher than average due to low pass rate
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES 312 by Year
Checking a specific MERCEDES 312?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 1997 MERCEDES 312
The 1997 MERCEDES 312 is a large car with a 2874cc diesel engine. 89 of these vehicles were MOT tested in 2024, making it a rare model on UK roads. It sits in the bottom 95% of 1997 cars for MOT pass rates.
With an average of 148,765 miles at 27 years old, MERCEDES 312 owners tend to use this car less than the typical driver.
1997 MERCEDES 312 Fuel Costs
The 2874cc 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). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 1997 MERCEDES 312?
Total estimated annual running cost is £2,250 (£188/month), broken down as £1245 fuel, £250 road tax, £55 MOT, and £700 predicted repairs. The higher repair estimate reflects the 63% MOT pass rate. Cars in this bracket tend to need work on suspension, brakes, and emissions components.
MERCEDES 312 Reliability Trend
Older MERCEDES 312s tend to have better MOT pass rates than newer ones, with an average decline of 17 percentage points across model years.
Buying a Used 1997 MERCEDES 312
At 27 years old, the MERCEDES 312 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 89 tests in our data, these figures should be treated as indicative rather than definitive.
Alternatives to the 1997 MERCEDES 312
If reliability is your priority, there are 4 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines:
- VOLKSWAGEN TRANSPORTER (1999) 70% pass rate (+7%) from 12,854 tests
- LAND ROVER DEFENDER (1997) 76% pass rate (+13%) from 10,084 tests
- LAND ROVER DISCOVERY (1999) 75% pass rate (+12%) from 5,978 tests
- FORD TRANSIT (1998) 72% pass rate (+9%) from 3,080 tests