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So the dealer put in a 0w20 full synthetic instead of a 5w20, which is what manual calls for. Would this void my warranty? I took it back so they can put the 5w20 in. It's a 5.7 hemi.
 

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Yes it can, especially if something fails and they blame it on the incorrect oil being used (though you'd have a good case for a lawsuit if the dealer didn't fix it). Could also affect the MDS & VVT in the engine. The short time you ran it though it should be fine. 392's run 0W40 with MDS & VVT.
 

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0 20w is full synthetic oil, 5 20w comes in both syn and dino. 0 20w offers same protection, cant see it affecting warranty since you cant tell by looking at it.
 
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