how can i know if my oil is not performing?
the old mechanics’ practice is to wipe the inside of the oil filler cap with a clean rag.if there is a visible brown deposit on the metal surface, they’ll say it’s time for an oil change.this isn’t really a valid test, but no one has ever ruined an engine with too frequent oil changes, where the opposite is certainly true!the best way to know about your oil’s performance is to establish a regular oil analysis program, which involves taking samples of the oil periodically to an oil analysis lab, and they’ll tell you exactly how the oil is performing.
