Originally Posted By: TurboTravis
Originally Posted By: OVERK1LL
Originally Posted By: TurboTravis
Def don't want to use a heavy weight in a high revving (7K++) mod motor. I'm sure most anything fine is for the standard pass car.
M1 0w40 is a very light 40-weight and quite similar to a heavy 0w30 like GC.
IIRC, a heavy 30 weight is what is recommended in decently built 4.6L.
Ford spec's 5w50 for the BOSS 302, which will spin to 8K.
Yeah, that's a much newer engine, my bad. John Mihovetz knows more about performance Modular engines than anyone in the world, and has noted several cases of engines that are met to rev high, not rev because the oil was too thick and the hydraulically controlled valvetrain would not work correctly
The BOSS 302 is still a Modular engine sir. The 30-weight recommendation (for the 4.6L) comes from one of the guys that helped design and test the engine for Ford.
The 5.4L in the Ford GT and GT500 (both standard Modular engines) also spec 5w50.
I'm not say run 20-glue-w-60 in them, but certainly a light 40-weight like M1 0w40 isn't going to hurt.