Quote:
Originally Posted by flatheadmurre
GL-1 and GL-3 doesnt have any EP additives that can harm the redmetals.
A modern good engine oil will do the job as good as a GL-1(i will get beaten for this...)
Flushing the gearbox...you have plenty of room for slush in it just change the oil and run it.
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Believe GL-3 does have EP additives, just at a lower level than GL-4.
API GL-1
Straight mineral oil
API GL-2
Mild EP for worm gears
API GL-3
Mild EP for spur and spiral bevel gears in axles and transmissions
API GL-4
Medium EP, MIL-L-2105 quality, moderate severity hypoid gears, manual
transmissions
API GL-5
High EP, MIL-L-2105D quality, all hypoid axles, some manual transmissions
API GL-6
Extra high EP, now obsolete