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Gearing up for all oil changes in my '99 GU RD28Ti in preparation for the cold
Just read the manual and see that the gearbox oil calls for 80W-90 GL-4 gear oil. I just realize that I bought GL-5 gear oil. Is this a problem or can I use the GL-5 in the transmission or do I need to go back and try to find GL-4? What is the difference between the 2?