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Can 20-Year-Old Motor Oil Be Used in a New Car?
I have a case of Mobil 1 synthetic motor oil stored in my shed for at least 20 years. The rating on the bottle is API SG,SF/CC,CD. Can I still use it on my 2005 Acura EL? Will it damage the engine, seals or gaskets?
-- Kenneth Lee, Blaine, WA
No, we do not recommend the use of this oil in your engine because 2005 year model cars need an API SM oil specification. Additionally, since stored for such a long time, the engine oil may have lost some of its properties. Also see our related answer on oil shelf life.