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Motor Oil
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12-06-2017, 04:07 PM
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Bad Moon
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Join Date: Apr 2016
Location: Medford
Posts: 498
M.O.C. #18546
As long as the oil is API CJ-4, it is OK to use. Synthetic provides better protection. By the way, your Duramax is 6.6 liter, not 6.4.
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2020 Chevrolet Silverado 3500 HD LT CC 4x4 Duramax
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