Posted by buickanddeere on April 19, 2014 at 08:03:03 from (184.151.36.226):
In Reply to: GL-5 vs GL-4 Gear Oil posted by Anthony G on April 19, 2014 at 06:24:32:
M-Man has it pretty well covered. GL-4 if maked as marine gear lube. It"s formulated to resist corrosion and still provide lubrication even when a seal has failed and the gear box is water contaminated. There is GL-5 and GL-5 yellow metal friendly . Yellow metal contains copper so that would be brass and bronze. Back in the bad old days . Operators of trucks etc would reduce gear box failures . By adding a spoon full of sulphur powder to the GL-1 oil of that era. The sulphur would leave a hard surface finish in the steel gears. Does sulphur corrode copper? Have a look at old copper battery cables around a lead acid battery. Many automotive manufactures spec motor oil in manual transmissions. Odd however many people will dump auto transmission oil in an engine and fuel tank as a wonder additive. Yet they are terrified to put a super duper corrosion inhibiting lube with excellent pressure point wear protection called motor oil in a transmission? Few people also understand that 90wt gear lube has the same viscosity as 40 to 50wt motor oil.
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