My mechanic went to Napa Friday to get 30 wt. non detergent oil. Our Napa guy told us that 30 wt non-detergent oil does not have an expiration date. He said all oils have an expiration date now. He said the oil does not go bad but the additives only last 5 to ten years and shake the bottle before putting modern oil in. Otherwise the additive's stay on the bottom. Who would of thunk? Doc


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