2002 Cadillac Seville SLS Q&A
2002 Cadillac Seville SLS Question: My 2002 cadillac sls has a valve knocking sound when the engine is cold.
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? - globalhelper
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. - milesauto