Old dog needs new tricks

[Tonypp]

This old dog was about to fill his gearbox diffs etc with a load of acquired oil but noticed in small print ( Not for manual) Looked up the oil grade and found it was api gl-5. Didn't mean a lot to me but after digging on the net found that though a good oil it eats yellow metal/ brass. Manual gearbox's should only have api gl-4. Next, go to buy correct oil and on the container it said for some manuals but also in the small stuff api gl-5. Now confused.
Some oil companies say api gl-5 can be used but reports on the web said that when analyzing drained oil there was more yellow/ brass in oil from gearbox's using gl-5 than ones using gl-4 and that the Synchromesh rings would wear to the point of not working .
OK, I suppose you all knew all this but I am from the old school and oil was just thick or thin. So the old dog has learnt a new trick- it might not do what it says on the tin.

[ScottieJ]

You can get yellow metal safe Gl-5 but that one sounds like it isn't, not all gearbox's use brass/bronze syncros therefore some are fine with GL5....vitaras aren't.


Use GL4 in the gearbox and the tbox and diffs are fine with GL5

[Tonypp]

LJ80 use brass syncros so will stay well clear for the gearbox but have used it in the diffs.