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Message: <blockquote data-quote="jase2201" data-source="post: 481354" data-attributes="member: 21017"><p>That may be one (of 16 if n42 engine) hydraulic lifters of the overhead camshaft is not functioning properly. It has a rattling/knocking sound (similar to a diesel powered engine). If you start the car oil is filled in back to the lifters then the sound may disappear. like your case once overnight the oil will sip out from the lifters thus creating no oil in the lifters during a long period of time (e.g 6-8 hours engine not running). Normally lifters do retain some oil in them if they are functioning properly... hope this helps...</p></blockquote><p></p>