Oil leaks (gaskets and seals)
Often reportedOil leaks are reported from the valve cover gasket, valve stem seals, or other gaskets that harden or lose sealing over time.
Engine Internal
When buying a used BMW 1 Series 118d 2015 (F20/F21), the most frequently mentioned issue is oil leaks (gaskets and seals). Timing chain stretching/wear is also commonly reported.
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
Oil leaks are reported from the valve cover gasket, valve stem seals, or other gaskets that harden or lose sealing over time.
Engine Internal
Some B47 engine units (2.0 diesel in the new 1 Series) report early timing chain stretching or wear, along with related tensioner issues.
Timing chain
The DPF may experience incomplete regenerations or clogging, especially if the vehicle is mostly used for city driving or short trips, as it cannot reach the required temperatures for regeneration.
Exhaust Emissions
In some B47 examples, common-rail injectors may wear, clog, or leak with increasing mileage, causing rough idle, smoke, power loss, and increased fuel consumption.
Fuel System
Some B47 examples report turbo wear or failure, causing boost loss, abnormal noises, and power reduction.
Turbo
Same trim, different year
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.