Vehicle & Technical > Discovery

gearbox oil

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Range Rover Blues:
It is like nats wee, and it breaks down with use so it should be changed.  The LT77 is unusual in that it has an oil pump, this is often more common in auto boxes, hence auto box oil is hydraulic oil, not EP or extreme pressure oil.  You cannot add oil aditives succesfully becuse the oilways and clearences are much smaller, to take advantage of the thinner oil.  In theory it should reduce transmission losses. (yeah right!)

Had a shock when I found out the Borg-Warner transfer box should be on ATF also, at least that's what the owners manual says!  Ours has EP80/90 in it but I think it's goosed anyway.

karloss:

--- Quote from: "datalas" ---
At the end of the day, LR didn't say "fill it with ATF" soley to make the begger noisier,  if it were as simple as using a heavier weight oil we'd all be driving round with bitchumen in them :-/
--- End quote ---


 :lol:  :lol:  :lol:
Just a thought. Just a thought.

Heard tale once of a dealer putting saw dust in an "old motor" gearbox to quieten it down before selling it. Don't know if it's true, and no, I don't know how he got it in there.

Mace:
Well, I've just changed the gearbox oil on my Discovery. The gearbox was notchy and sticky so I drained the old oil out. It was black and horrible (but it was ATF) and I reckon the oil had not been changed since the box was swapped 40k miles ago.

Anyway, I dug deep in my wallet and bought difflocks Midas MT75D fully synthetic ATF oil. All I can say is WOW ! Ok changing the oil from crap to new would have made a difference anyway but this stuff is brilliant. I've changed gearbox oils before in similar conditions but never has it made such a difference. No more notches, smooth gear change, much quieter and the whole transmission feels free, not tight.

I'm going to try the transfer box and axles next, by swapping the ep90 for their fully synthetic Trogan oil. I'll let you all know what it feels like but I think I know the answer already.

muddyweb:
Don't know what the prices are like, but if you can do it, I would recommend buying in bulk.

I use a fully synthetic oil for my engine, I get it in 20L drums from my local Total Oils depot.   Costs the same for 20 Litres as Halford charge for 5..  Similar thing with ATF and EP.  (Although I just use normal mineral versions of them)

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