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Oil Question?

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02-03-2009, 05:50 PM	#1
mcashman Registered User Join Date: Oct 2008 Location: Bozeman Montana Posts: 21	Oil Question? I just bought a 1971 c20 with a factory 400, 83,000 original miles. Does it matter if I use 10w-30, 5w-30, or 10w-40? I had a 1970 with a 350 and I always used 10w-30. Just wondering if it makes much of a difference?

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