Redline has a group 5 base stock, as such, it is extremely stable even more than a group 4 (AMSOIL + Mobil1),Redline 10w-40 is made with base stock, that has so much innate viscosity spread, that it doesnt require viscosity index improvers adding to its stablity even more.
A very strong oil especially in theory.In practice Used Oil Analysis generally look no better than with Mobil 1 or AMsOIL.
But I havent seen many UOA's with Turbo cars in summer.. so its hard to tell how significant those results are.
VR1 is possibly one of the best non synthetic oil for a trubo application.I prefer a good and easily available Mobil1 15w-50.At my local target for 3.79/qt in all grades including 15w-50....
But truth be told I have yet to see a UOA comparing VR1 and Mobil1 in a summer turbo application so its all really conjecture based on what we know about the lube stock and the addiitve packages.
Fred..
