Originally posted by grout20
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The longer version is:
Originally Austin-Rover recommended 10w40 for the cars and SAE90 for the vans both changed at regular intervals.
Then along came the rover 200/400 using the same box and in the turbo it was recommended to use 75W80. There were lots of warranty claims for dead gearboxes.
They then standardised the oil to almost all boxes used in the MG-Rover range at that time to MTF94 and drastically increased the service interval. This helped marginally with the warranty claims on the turbo versions and also decreased the number of oils that needed to be stocked so saved cost. The MTF94 was essentially filled for life, but I think some service plans had a first change at 100,000 miles.
This is the oil that was used in all subsequent PG1's and so is what I'd recommend to use.
10w40 will work fine in all but the torsen differential equipped gearboxes, but will need changing regularly. Any oil in the gearbox is better than low oil level which will quickly wear out the differential bearings.
The original PG1 gearbox on my 600 ran to well in excess of 250k miles before the differential bearings finally wore out, and that has more torque than all but the most modded of maestro/montegos so MTF94 seems to work well in my experience.
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