01VQ30DE Timing Chain Tensioner and Guide Failure
The VQ30DE fitted to Y33 and Y34 Cedric/Gloria models develops timing chain slack due to tensioner check-valve wear and guide rail erosion. Cold-start chain rattle is the primary symptom. The plastic guide rails crack and shed fragments that contaminate the oil and can block the oil strainer, leading to loss of oil pressure. At the mileages these cars now carry in NZ/AU, chain guide failure is considered near-universal if not already replaced.
Symptoms to notice
What to check
Ask the seller