Gearbox oil

[GerryT]

Reading past info on gearbox oil it seems 140 weight is good , should this be Gl 4 or GL5
Would this quite down 3rd gear at the moment I am using 75/90 weight
Thank you

[draxdave]

I have seen 85/140 GL5 recommended, and is what I use. I have used a moly additive in the past, but not currently, Good Luck with 3rd !!

[johnbirchjar]

I found the one that H/Davidsons recommend for their bikes( made the old g/box run a lot quieter) I used it for years in my Classic(and it's bright red,so any leaks are quickly spotted)J.B.

[Anthony Duffield]

I use Comma gear oil EP85W-140 GL-5 mineral.

[Interpol2471]

Andover Norton now stock a really good 85w140 gl4 oil so less aggressive on gold coloured metals than gl5