Quote:
Originally Posted by firebirdguy
just wanted to clarify some of this... gear oils do not last indefinitely, the additives break down & wear out as well as the oil itself is subjject to extreme pressures & whats called shearing occurs due to this. plus a rear diff gets very warm from just normal driving, when towing the rear can get very warm to almost hot. so while there are no combustion byproducts in gear oil, there is wear & break down that limits the life of the oil & why manufacturers have a change interval for them.
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True. If a fair amount of heat wasn't involved, then diffs wouldn't have vent valves. Further, I found a video on Youtube showing what gear oil looks like inside the diff while driving. There was a transparent diff cover. The gear oil gets aerated to the point that it looked like a chocolate milkshake.
