Originally Posted by wnokes7
My 05 Chevrolet 3500 with the allison transmission has never been over 180 degrees, even on the hottest days of the summer.
However according to a retired Allison engineer, Trans-Syd can run at 220 and tolerate short bursts of up to 350 with no problem.
From Diesel place.
It will take temperature of to 450F (when you get to the Flash Point). I'd say you could run it for long periods of time up to 250F and up to 350F for short periods of time without much damage to the fluid.
Fluid life is proportional to heat so the higher the temperature the faster it oxidizes. It has very long life at constant temperatures up to 220F.
Thomas L. (Tom) Johnson
President and Co-Founder
JG Lubricant Services, LLC