You scratch mine, I'll scratch yours. We get skewered.
-A
-A
bulwnkl said:The Mustang engine, which has been driven VERY HARD was:
A) Spotless inside. You could EAT off the lifter valley.
B) Showed ZERO visible wear. There was no ring ridge, visible cross-hatching.
C) Showed ZERO varnish build-up. No stuck rings, no varnish on the cam, rockers, lifters....etc.
It's had pretty much every grade of M1 through it, from 0w20 to 5w50. Oil changed at 10-12,000Km.
I've had the same experience with M1 (5w30). I had a '99 4.6 2V that I beat the [censored] out of for over 100,000 miles and ran 5w30 M1 for the entire time (both the Tri-Synthetic and SuperSyn).
The engine was eventually taken out by a set of weak aftermarket valve springs (PTV contact, thanks Comp). But when we tore the engine down, I discovered an engine with cylinder crosshatches that looked fresh from the factory (also no ridge ring), main bearings with numbers still plainly visible, and all internal oil-exposed parts looking as if they came out of a 1500 mile engine.
I don't know if the current M1 has problems with cam wear or not, but up until at least 2 years ago their oils were awesome. I would still run M1 in confidence, even though I have made the jump to PP based on price.