Humvee21
FRF Addict
- Joined
- Aug 17, 2011
- Posts
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Hmmm, guess my 2012 Shelby Gt 500 is not so tight then ?, its 5.4 requires 5w-50 oil !
I would just follow what the owner's manual says. You may not see the short term consequences from running the wrong weight now, but you very well might see it in the long term.