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I don't have the owner's manual right in front of me, but I can tell you that I use 10W-30 in mine and that was one of the ones listed in the owner's manual. answer it says what weight GM recommends right on the oil filler cap. its 5W30 forn my 2003 6.0

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16y ago
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Q: What oil type do you use for 2007 silverado?
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