which rear end oil to use?
#2
According to the owner's manual (page 535), for a GS300 the differential oil type should be Hypoid gear oil API GL-5 and the viscosity above -18F should be SAE 90. Below -18F use SAE 80 or SAE 80W-90. The SAE 75W-90 is for use in GS430 differentials (page 532).
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