Reply to thread

Message: <blockquote data-quote="Mustang68" data-source="post: 379880" data-attributes="member: 10502">that pretty much is the rule of thumb on alot of the oils.. but also with these newer synthetics your able to go further on them.. (or least your suppose to be able to) but personally for me i go by the 3000 rule just to keep the engine clean and happy on the inside... main reason for the 3 month rule (with some synthetics its longer) is because once you pop that top on the oil can/bottle (depending on your brand of choice) just like with brake fluid it allows air and moisture into the oil.. Which in the end harms your engine and the performance of the oil. if the oil cant do its job by keeping the parts properly lubricated it allows friction to start building up, which in turn builds more heat on those crucial parts, which in turn can cause them to fail costing you big $$ in repairs.. The engine itself is not perfectly sealed to keep condensation out of the oil.. with a car driven on a regular basis the condensation thats seeped in gets burned off allowing the oil to keep it performing like it should.. the other reason for it is once that tops poped and run through the engine it starts rapidly breaking down its chemical makeup. least thats what the text books said and how they explained it to us when i took autoshop back in hs..</blockquote>