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Model reliability
Mercedes-Benz 300 reliability
The Mercedes-Benz 300 fails its MOT less often than most cars over 10 years old: 24.1% of 2,959 tests failed in 2023, against 39.7% on average.
Over 10 years old
24.1% failed their MOT
From 2,959 MOT tests of Mercedes-Benz 300s this age.
Where it does worse than other cars this age
Fails 2× as oftenFront and rear fog lamps2.4% vs 1%Fix about £30
Fails 4× as oftenFuel system1.5% vs 0.4%
Fails 3× as oftenChassis1.3% vs 0.5%
Advised 50% more oftenFluid leaks15.1% vs 10.1%
Advised 49% more oftenRigid brake pipes12.4% vs 8.3%Fix about £120
Advised 3× as oftenWheel bearings4.6% vs 1.7%
Advised 65% more oftenFlexible brake hoses4.3% vs 2.6%Fix about £120
Checking a Mercedes-Benz 300 before you buy
Look at the parts above at the viewing, and read the car’s own MOT history: advisories for the same parts suggest the problem is already starting. Sweep’s free check shows every MOT, advisory and mileage reading for a registration.
Source: DVSA anonymised MOT tests 2023 (Open Government Licence v3.0). Failure rates compare this model with all cars in the same age band. Fix prices are typical independent-garage estimates.