Quote:
Originally Posted by Aarongriffey
I always heard that GL4 was safe to use and that GL5 would eat yellow metal.
In our life time GL 5 will stain the yellow metal but not eat it up. Is causes it to turn grey.
If you throw salt over your left shoulder you’ll be ok.
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I donīt know how many gearboxes i have changed syncros in where the owner in good faith bought the most expensive gearoil he could find.
It takes a very short period to turn the oil into a nice brass colour.
Do you know how EP additives work??
Itīs not a nice little magic cushion that goes in between...it etches into the metal forming a wear barrier of oxide.
Even if GL4 doesnīt eat away on brass they reduce the friction in the synchros which isnīt desired.
A gearbox isnīt a hypoid gear like a rearaxle and load is very mild in comparsion.