BMW diesel ownership above 150,000 miles requires a different mindset. N47 is the risk engine. N57 and B47 are far more capable. This guide covers real costs and what to budget.
This High Mileage Guide guide combines structured analysis — verdicts, risk scoring and cost ranges where we have enough data — with real fault cases pulled directly from MyCarFault's reporting database, so the guidance below reflects what owners actually experience rather than manufacturer specifications alone. Background and analysis come first, followed by the linked fault reports and related guides you can jump to directly using the links above.
BMW diesel high-mileage ownership splits sharply by engine. The N47 in 318d and 320d variants carries the timing chain risk that makes 150,000+ mile ownership expensive without prior intervention. The N57 530d and B47 (post-2015) are genuinely capable of 250,000+ miles.
N57 530d with full history — yes. N47 520d without chain work — avoid unless priced very low.
N57 in good condition: £800-1,200/year at independent specialist. N47 (chain done): £1,000-1,500.