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Hello there, I know there are alot of topics regarding the same question, But i need some clarification. I am doing a major service on my completely stock S15 Spec R i am thinking of putting Motul Gear 300 75w-90 in the gearbox and helical diff. The oil is API GL-4/GL-5 does that mean i can use it in the diff or does it have to be GL-5 only oil and would full synthetic be okay or would it need mineral and is the grading 75w-90 okay since the manual is saying to use 80w-90. Sorry for all the questions just need a bit of help thanks