Copy of a Land Rover Tech bulletin...it shows that the MTF94 for the R380 can be used in the LT77 and is back dated. Part Number STC9157 for 5 litres
Texaco make the oil for LR apparently so you can get the equal from that company which theoretically,will be cheaper than the Main Stealers...
TECHNICAL BULLETIN N O : 0007 ISSUE: 2 PAGE: 1 OF 2
MODEL/DERIVATIVE: Bulletin N o : 0007
Discovery / New Discovery
CDS. ref: L8462bu
Defender Date: 29.03.2000
All R380 manual gearbox derivatives - refer to text for specific change points
RE - ISSUE INFORMATION:
Incorrect specification reference deleted from PARTS INFORMATION.
Please destroy your existing copy and replace with this Issue 2.
GEARBOX OIL - CHANGE TO SPECIFICATION
At the following VINs, the original oil fill specification for the R380 gearbox was
changed to Texaco MTF94 high performance oil:
Range Rover - WA 384300
Discovery - WA 752315
Defender - WA 131138
New Discovery - All vehicles
The Freelander PG1 gearbox has used the new oil since introduction of the model.
MTF94 will be recognised by its orange/honey colour as opposed to the red
Dexron II oil previously used, and is now available from Land Rover Parts.
It is now the only oil which should be used for topping up and complete fill on
R380/PG1 gearbox applications.
The new oil is compatible with the old and to enable earlier vehicles to benefit from
its introduction, should be used retrospectively on vehicles prior to the above VINs
for all top up and refill requirements.
Refer to PARTS INFORMATIONoverleaf for details.
Until further notice, current Service Schedule gearbox oil change periods are
retained and must be adhered to.
IMO I also would never use EP90 for the LT77. The heaviest oil spec,as far as I am aware,by LR, was normal engine oil for the early V8 RRovers.