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BMW B48
Modern turbo-petrol four-cylinder that is usually a strong base when cooling, oil leaks, and service intervals are controlled.
VAG EA888
A broad turbo-petrol engine family whose risk changes significantly by generation, oil behavior, timing design, and cooling history.
BMW B47
A more mature BMW four-cylinder diesel with improved timing architecture but continued emissions and service sensitivity.
Mercedes-Benz OM651
Widely used diesel with strong fundamentals but meaningful injector, timing, cooling, and emissions-system dependencies.
ZF 8HP
Widely respected eight-speed automatic whose long-term quality still depends on fluid condition, sealing, adaptation, and drivetrain context.