As hybrids without turbochargers tend to produce varnish rather than sludge it makes sense to look for oils that mention resistance to varnish formation or resistance to NOx-oxidation (nitrooxidation) or suitability for use in hybrids. If I remember correctly Dexos oils have declared increased resistance to oxidation, however, this was always mentioned in the context of turbocharger protection i.e. high-temperature oxidation rather than NOx-oxidation. Does Dexos1-Gen3 approval include some tests for varnish formation or what is your motivation for looking for Dexos1-gen 3?