Technical Database
Engine and gearbox library
Identify the exact powertrain before judging a car. Each profile turns common reputation into practical checks, service priorities, and model connections.
Engines
Petrol and diesel families to identify before buying.
BMW N47
Efficient four-cylinder diesel whose buying risk is dominated by timing-chain history and cold-start evidence.
BMW B47
A more mature BMW four-cylinder diesel with improved timing architecture but continued emissions and service sensitivity.
BMW B48
Modern turbo-petrol four-cylinder that is usually a strong base when cooling, oil leaks, and service intervals are controlled.
Mercedes-Benz OM651
Widely used diesel with strong fundamentals but meaningful injector, timing, cooling, and emissions-system dependencies.
VAG EA888
A broad turbo-petrol engine family whose risk changes significantly by generation, oil behavior, timing design, and cooling history.
Gearboxes
Automatic and dual-clutch units where service proof changes the risk.
VAG DQ250 DSG
Six-speed wet-clutch dual-clutch gearbox that can be durable when fluid service and mechatronics health are taken seriously.
ZF 8HP
Widely respected eight-speed automatic whose long-term quality still depends on fluid condition, sealing, adaptation, and drivetrain context.
Mercedes-Benz 9G-Tronic
Efficient nine-speed automatic that needs correct fluid service, software context, and careful low-speed testing.