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Q: My 2002 cadillac sls has a valve knocking sound when the engine is cold. on 2002 Cadillac Seville SLS

What is causing this. It has 61,000 miles and quite s down when it warms up
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poss dirty inside of engine. rec doing an oil cleaning service to start with. that is the cheapest thing to start with. have you had regular oil changes?
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Any noise could mean lots of things not always serious but it should be checked as soon as possible.....even minor things can become serious if put off.
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