Engine
BMW N47 vs B47
BMW diesel generation comparison focused on timing-chain risk, emissions systems, maintenance evidence, and safer used buys.
BMW N47
58
/ 100
BMW B47
74
/ 100
Best used buy
BMW B47
B47, unless the N47 has unusually strong timing-chain evidence, oil history, and cold-start behavior.
The B47 is the safer default because it improves the biggest N47 ownership concern. The N47 can still work, but only as a documented car bought with timing-chain risk priced in.
Key differences
- N47 risk is dominated by rear-mounted timing-chain condition and repair evidence.
- B47 is generally improved but still needs emissions and cooling checks.
- N47 cheap purchase prices can disappear quickly if chain work is needed.
- B47 usually gives better inspection confidence for normal buyers.
Buyer advice
- Do not buy an N47 without true cold-start listening and timing paperwork.
- Scan both engines for DPF, EGR, glow, injector, and boost faults.
- Treat vague oil-service history as a serious negotiation point.
Red flags
- Chain rattle
- Long oil intervals
- DPF warnings
- Smoke under load
- No timing evidence