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I think I'll switch to SAE 50. Too many unknowns about GL-5 for me.

I think I'll try to get ahold of someone at NAPA and ask them if their GL-5/MT-1 has any sulfur in it. What are they using for their EP additive. If it does have sulfur, what would be the effect on a brass syncho with steel gears in our transmissions. Someone has to know for sure. I might try...

I read this yesterday, I think on another forum while searching on Yahoo. I can't say if it's correct or not but it is something to concider. GL-5/MT-1 has sulfur in the EP additives. It takes a high temp (about 250 degrees) to "activate" them, then they corrode the brass. At low temps, the...