CRSCRS Posted August 5, 2018 Share Posted August 5, 2018 Hello all, would I have it correct that GL4 oils are yellow metal safe where as GL5 oils are less so or is this an over simplification ? Just thought I would ask before I go ordering any. Its for various bits on the Martian, namely front axle bevel boxes/differential/gearbox etc cheers Chris Quote Link to comment Share on other sites More sharing options...
Starfire Posted August 6, 2018 Share Posted August 6, 2018 There is a lot of contention over this topic. I would suggest contacting the oil manufacturer and asking them whether it is suitable. 1 Quote Link to comment Share on other sites More sharing options...
lowfat Posted August 6, 2018 Share Posted August 6, 2018 when I bought my ep90 for my stalwart from rye oils the salesman was very aware of the brass problem. Quote Link to comment Share on other sites More sharing options...
marvinthemartian Posted August 6, 2018 Share Posted August 6, 2018 Chris, main gearbox uses engine oil, SAE 50. 1 Quote Link to comment Share on other sites More sharing options...
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