Noise has me rattled

Holden Holden Advice Holden Commodore Holden Commodore Advice Holden Commodore 1991
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ON OCCASIONS when I start my VN Holden Commodore it makes a rattling noise. It starts very noisy, but lessens after five minutes. By the time I get to my mechanic it has stopped. Any ideas?

THE hydraulic valve lifters could be worn. They typically rattle for a few minutes before the oil pumps them up. If they're worn it can take a little time for the oil to work, and once it does they generally go quiet.

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