Stable how?
So you’re saying you can predict the future performance of a motor oil based on the decomposed metallic elements shown in a $30 spectrographic analysis?
Lower knock and thicker basil is good, yes. And it’s a “winter viscosity”?
not sure Amsoil high cost is justified for shorter OCI. Its good oil, but expensive
Do you have anything to show actual shear in the VM for this oil? Or is that some sort of Internet lore?
I'm generally a fan of going by specifications for assurance. However, some smaller companies I do trust. HPL, Amsoil and Red Line for example. Amsoil knows what they are doing. They've been doing this since 1972. They also have their own mechanical engine lab where they can test and develop internally. I wouldn't worry about that with Amsoil. If you can overlook some of their past marketing and pushy dealers (MLM model), they've always made good oil. In fact their current offerings are the best they've ever produced. It seems to have coincided with the mechanical engine lab. I think in the past they had to rely on SWRI more often.
A thicker oil will flow through the turbocharger slower and therefore remove less heat, but I doubt a 0W-40 would cause undesirable effects.
www.sauderschelkopf.com
Or more properly recommends the grade.
