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Discussion Starter · #1 ·
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.
 
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Discussion Starter · #2 ·
Skin,

You have to use Hypoid oil as Mitsi recommends, If you use normal gear oil the things will go on melt-down ;)
 
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Discussion Starter · #3 ·
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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Discussion Starter · #4 ·
Syntrax in the gearbox, transfer box and the rear diff is fine as long as you have AYC of course.
LSD oil must be used in the rear diff if not.
 
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