The Opel 1.3 litre CDTI (the Fiat Multijet based Z13DT / Z13DTH / A13DTE family) runs a chain driven valvetrain. The chain depends on the oil level and the oil quality: if the oil level is low or the oil is worn out, the tensioner loses pressure and the chain stretches.
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Symptom: a metallic rattle on a cold start. If the rattle is left alone, the chain can jump and the engine is badly damaged inside. The replacement is labour intensive, around the sump and the turbo.
Short trips also coke the particulate filter and the EGR valve.
What to check
- Insist on a cold start: 5 to 30 seconds of metallic rattle from the timing side is suspect
- Check the oil level and the service book: with a low level or worn oil the tensioner loses pressure
- Ask whether the chain kit (chain plus tensioner plus guides) was replaced: ask for the invoice