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MAIN GEARBOX (R380)
The ideal lubricant for the R380 Gearbox should meet with the following criteria:
v Full Synthetic
v API GL-4
v SAE 75W80
Land Rover prescribes in my Service Manual that lubricants with Dexron II specification should be used. This is oil that has been used for automatic transmissions (Red oil). According to Castrol this indicates that the R380 gearbox is rather more viscosity sensitive than performance level sensitive, in other words it’s something like a manual transmission calling for engine oils. During 1998 they have changed the main gearbox lubricant to Texaco MTF 94. With this they have changed the specifications to a GL-4 lubricant with viscosity 75W80, although my Service Manual still prescribes that oil with a specification of ATF Dexron IID be used. In any case, the only other oils I could find with similar specifications are:
Castrol VMX (Semi synthetic) 75W80 GL-4
Fina Pontonic TI (Semi synthetic) 75W80 GL-4
Shell Spirax (Part synthetic) 75W80 GL-4
Castrol also recommends that Castrol VMX 80 be used in the main gearbox (R380). That is why Land Rover uses VMX in the main gearbox.
The ideal lubricant for the R380 is undoubtedly Texaco MTF 94. It is marketed in the RSA as Caltex MTF 94. Land Rover has done extensive research on this oil and it is the best. The specifications of MTF 94 are as follows:
Texaco MTF 94 (Full synthetic) 75W80 GL-4
I have full specifications on MTF 94 if you would like to get hold of it. You will find MTF 94 at Caltex Depots around the country