Thread: Gearbox Oil

it'll be fine

Thanks Dave,
would that be the same for the Fairey OD unit ????

whitehillbilly

Yes.

John

Thanks John.

Originally Posted by JDNSW

Yes.

John

concur.

the stock Series any is a 2 oil machine. Engine oil (15/40wish) for the engine and 80/90 for everything else that has oil in it.

I have been using GL5 for the past year or so.
Now a supplier has found me a 75/90 GL4 which I have ordered and will do a drain and replace.
What damage is likely to be seen with this use of a GL5?
Does it pit the bronze sleeve and synchros or what?
Will they disintegrate or will it take longer than a couple of years to see any negative affect?

Hi 123Rover50.
If you Google search, some say they have been using GL5 for years, in a series Land Rover, others say the chemicals attacks the bronze bushes.
Yet there appears to be no clear evidence, to say that is so.
Seems mostly hear say.
I would like to hear from any members who have rebuilt 50 or so Land Rover gearboxes running GL5 for 5 years to tell us different.
Anyway I like mineral oil, don't know why but always run it in my vehicles.
So I intend to run, in my gearbox the closest I can get to the Original, cheap and local, and available.
That being what I listed from the local auto shop. ( GL4 and they give me a good price )
Look forward to the feed back.

whitehillbilly

It seems to depend on what was used to give the GL5 oil it's extreme pressure characteristics. My local oil blender said that their GL5 should be OK but then suggested that they blend me some GL4.

Taking that into account maybe some GL5's are OK and others may cause problems with bronze bushes etc. in older boxes/diffs.
With that in mind why take the risk ?


Colin