Can I use CASTROL SMX SYNTRAX UNIVERSAL 75/90 GL5 Spec in the rear diff and transfer box, or should I use a dedicated HYPOID GEAR OIL 90/80w GL5 SPEC like Mitsubishi recommends.
After using Syntrax in the gearbox only I decided to go for fully synthetic rather than semi synthetic and went for AMSOIL 75W90. It is suitable for use with Hypoid gears so I use it all round.
Also look for Redline, Motul, Millers fully synthetic gear oils.
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