Quote: Well I had 2 1996 vetts both 6sp with the LT4 one with minor upgrades and the other one was pushing 490hp with heavy ol steel rods and regular ol pistons and I beat the he!! out of both of them for years and the Mobil 1 did just fine.
Mobil 1's formulation has changed significantly over the last 15+ years. The stuff from back then was better suited to that type of application than what's on the parts stores shelves today.
As of a couple years ago, the Mobil 1 4T bike oil was the same formulation as their 1990's "NASCAR" oil. It had the right additive package.
The 15W-50 Mobil 1 is also still suitable. It has elevated levels of ZDDP compared to other grades of Mobil 1.
