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.