Now we've resolved that any advice on the Oil as I wouldn't mind having a go this winter (replacing the gearbox oil on an MT75 box)
I am using a Type 9 which does not have a drain plug. Recently I removed the engine/transmission. All the transmission fluid drained out the back (where drive line goes) all over the garage floor. OUCH! While I had the transmission out I drilled and threaded a hole where there should have been one. Careful to clean out all the drill shavings etc. I guess I am "Old School".
