well…..what exactly has Amsoil said about this…lately?Who said Amsoil isn't?
They have become (or maybe always were) pretty secretive.
People look at Amsoil, HPL, etc pricing and desperately want to know why they should fork over the extra money. In earlier post(s), I tried to show why I thought Valvoline Premium Blue Restore differentiated itself from off-the-shelf Pennzoil, Castrol, and QuakerState in results from a fuel-diluting TGDI engine. But some of the differentiation is due to VPBR being a thicker oil (and HDEO despite use in TGDI engine). The rest is due to its unique composition. Amsoil SS (ASL) is currently in the crankcase, so we will see how it does. One of my regrets though is I was steered toward the 5w30 ASL, at Amsoil tech’s advice, as well as an independent’s advice, instead of a thicker oil (0w40, 5w40 or Euro) despite having indicated fuel dilution was an issue. To be fair, HPL also pointed me to their 5w30 PCMO, instead of some thicker or more robust formulation….the more I read, the more I hear starting with a “thicker” oil is the only solution. Again, if Amsoil would come out and state why their oil is better (against fuel dilution), and/or recommend upping the grade to offset the effects of dilution, it might help us duffers.
If the Amsoil stays in grade for ~8500 miles (and theoretically it could, barely, even with 5% fuel, if negligible shear or VI degradation) I will be happy enough. If not, I still might be happy with a thicker Amsoil…ie not taking Amsoil tech’s advice.
(By the way, some gear oil is on my radar prior to next engine oil change. Maybe I should reach out to you, instead of the Amsoil tech department????)