Quote:
Originally Posted by OrbitalEllipses
While you can't void a warranty, the dealership will certainly attempt to -- and likely succeed in -- void any warranty claims regarding the powertrain when they find out you were using oil not specified in the manual; even if that oil likely provides better protection.
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That is where is can become dicey. The manufacturer has a vested interest, relating to CAFE requirements, in ensuring that the oil used for EPA certification is used in practice.
OW-20 should be able to work acceptably if an engine is appropriately designed.