Vauxhall coarser

I just bought a Corsa 1.2SXI. I have been driving it now for 3 weeks and it has just started to make a tapping noise very much like a diesel. I have changed the oil and filter (the oil was dirty and the filter worse). But it has made no difference. I used Castrol Magnatec and a Halfords filter. When I start the car from cold it’s fine, sounds good, no tapping at all. But after about 10 minutes the tapping starts and gets worse. Any help, please?

Asked on 19 June 2010 by KC, via email

Answered by Honest John
DO NOT DRIVE IT AT ALL. DO NOT RUN THE ENGINE. The camshaft retaining bolts will have become loose. They need to be re-tightened before the engine is started or the camshaft will break.
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