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[quote=Anonymous][quote=Anonymous]If I have a car with synthetic oil, normally good for 7-10k miles, and if I end up driving, say 2k miles per year, can I wait 3-5 years before the next oil change at 7-10k mark or do I need to change it more frequently? Does oil degrade with time even if not used/in circulation in engine? [/quote] It doesn’t degrade, but you should change it at least annually. Reason being, oil accumulates gasoline contaminants and combustion products from the cylinder walls. If the oil heats up enough during driving, these contaminants are partially boiled off. But cars that don’t get driven enough to boil them off hold them in solution with the oil, and they can damage seals and other parts. Changing the oil is the easiest way to get rid of them if you don’t drive enough. [/quote]
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