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GL4 Vs GL5 oils and yellow metals

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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 

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There is a lot of contention over this topic. I would suggest contacting the oil manufacturer and asking them whether it is suitable.

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when I bought my ep90 for my stalwart from rye oils the salesman was very aware of the brass problem.

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