I have run my discovery R380 gearbox on atf from new, as this was the original specifications oil, later models specced mtf oil which is allegedly better.
I had the gearbox rebuilt 3 years ago as I had a vibration, turned out it was 1 bearing in the center of the box. Bearings and gaskets renewed but all other internals were reused. Gearbox currently has 200k+ miles on it and is as smooth as silk.
Provided the oil meets the spec at time of engine build and is changed regularly it should be fine. Although I use castrol 0/30 A5B5 I nevery get to anything near 185k miles between oil changes, annual oil change is normally 8 to 10 k
All oils are changed more frequently on the discovery, it is used off road and regularly waded emulsified oil is useless anywhere except painted on the garden shed.
A bit of common sence keeps your motor in top condition no matter it's age.
Paul.
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