peabody george is right. thin oil will make its way thru tighter clearances......Thats why todays cars require 5 weight or even 0 weight. this is because higher visicoty oil will not lube the bearings in todays engines per manufacture specs. alot of forigen cars reqiure 0 weight oil. In all my cars and trucks I run castrol syntec 5-50 weight. It will lube the vital engine parts eeven when it is -20 and makes for easyer starting.. Plus thre oil will not break down in extream temps. inother words you get all the benifits of a "5 weight" oil when its cold and "50 weight" oil when the engine is under extream temps. best of both worlds. I would not run it in a car that has a oil leak as it is 6 bucks a quart.
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