I'm using the 40C as a guide to determine "generally" how thick the oil is at 0F to 30F.
40C = 104F
104F is considered "cold" in terms of engine operating temperature. My ECT and CHT (when the engine is at operating temperature) is kept around 210-220F with the stock thermostat and fan settings.
I can't find many of the cold cranking viscosities for oils, they mainly just list the 40C and 100C viscosities.
In addition, Amsoil's viscosity grades don't seem to match with many of the Mobil 1 viscosity grades. One 5W-30 is closer to the other's 10W-30, etc... when you look at the 40C and 100C cSt.
If you can determine without a doubt that the M1 0W-40 can outlast, outcrank, and outperform a home brewed M1 mix, then I'll go for it. Until then all I hear is M1 0w-40 shearing out rather quickly and how the valvetrain chatters during cold starts using the 0W-30.
I'd try 0W-30 or 5W-40
EXCEPT ITS NOT AVAILABLE ANYWHERE IN THIS AREA. We don't even have German Castrol 0W-30. There's a lot of stuff I'd like to try but they're just not sold in the stores or they're overpriced. Meijers did carry some of the more "exotic" M1 oils like 0W-40 and 0W-20 but at $5/qt it's not a bargain. Autozone, Advanced Auto, and Murrays are also overpriced.
G-Man II: Have you run out of oil brands to use as your username?
[ May 16, 2004, 02:39 PM: Message edited by: metroplex ]