2011–2013 MINI Countryman: Rattle on cold start (N18 timing chain and tensioner)
Likely causes, ranked
- Tensioner losing tension or seal ring leakDIY
- Worn chain and guidesShop
Real-owner fix counts will appear here as reports come in.
DIY or shop: See DIY or shop section
Parts to check
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Symptom: A rattle for a few seconds on cold starts, oil around the tensioner, and later timing codes.
Likely causes
- Tensioner. MINI's service action says the tensioner seal ring can be too soft, causing leaks and lost tension. NAM owners often replace the tensioner early.
- Chain and guides. If the rattle continues, owners report the chain and guides need replacing.
DIY or shop?
Tensioner DIY for careful owners. Chain work is a shop job.
Useful steps
- Listen at cold start.
- Ask a dealer whether the service action was done.
- Use the correct oil and change it on time.
Vehicle focus: 2011–2013 MINI Countryman.
Safety / mechanic note
A jumped chain can wreck the engine. Verify with a mechanic or dealer.
Recalls & service bulletins
Technical service bulletins
- SI M11 05 12 MINI service action for an oil leak at the N18 timing chain tensioner. The seal ring is too soft and tension can be lost. Inspect and replace the seal ring. Details
NHTSA complaints: Count unavailable: too few NHTSA complaints matched this issue under the model names we could query to give a reliable number (checked 2026-10-15).
Always check your VIN for open recalls at nhtsa.gov/recalls.
Sources
What actually fixed it?
Had this problem? Tell other owners what the real fix was. Reports are counted above; we never show made-up numbers.