Gear Box oils

[Rossvickicampbell]

Gents - what are people using for gear box oils?  I have been using Silkolene light gear oil - 75-80w SAE - but without going into the whys and wherefores need to change and want something just as good.  For a YZ 360.

thanks

Rossco

[Brian Watson]

G'day Slim.. not sure what the factory recommended back in the day.. but I am using Motorex gear oil...can get it from Don at Cycle Products West down in Bibra Lake.. when he gets back ..he is in Abu Dhabi for the rally atm..

[Rossvickicampbell]

thanks old fella - will have a look.

[oldfart]

Supa crap auto .... I use Castrol manual transmission  VMX 80w   

[Ted]

ATF......cheap. Change it after every ride.

[oz555ktm]

 Motor Cross ATF . and Ilke ted said change every Meeting .
 

But if you are Now moving  to Vinduro s VMX 80  or  ATF

[kitakitsune]

Castrol GTX 20-50 or Valvoline equivalent. usually around $15 when on special. Used in 79' rm125n and '98 rmx250.
Changed it every 3rd or 4th ride. Never had a problem.

[micko]

Motul Transoil Expert 10w40 in my RM370 & 250 

[80-85 husky]

use the Early ford BorgWarner ATF or Briggs and Stratton straight 30 wt oil. works fine, no need for fancy named oils with loaded costs. they are normal oil with a few additives to make you pay more

[grouty]

Ahh ... the oil debate !

Just my tuppence worth. I have used Silkolene Medium weight gear oil in all my 2 strokes since the 1980's. Never ever had an issue. Just  change it often (within reason). I have been a little lax with the Husky 390WR, but it has never shown signs of wear in the last 12 years. That one gets done after 200 miles or so. The only fly in the ointment now is the Husky Auto .... that's a whole different story.

[80-85 husky]

I used to use silkolene in the husky I had years ago. good oil but a bit pricey now.
I cant believe I spent all that money on special light weight gear oils when I had a service station full of ATF at my disposal :'(

if you want to talk high loading clutch application, you cant go past a big block pushing an auto....ATF works fine!

[Brian Watson]

I can't disgree with ATF.. back in the 70'/80's when Dad worked at an Auto trans place .. and we had plenty (for nothing) it worked a treat.. but now.. the gbox's are 40 years older.. I'm happy to get some hi-tech modern oil with a bit more cushioning for the tired old gears and shift forks..

[Tim754]

 "a bit more cushioning for the tired old gears and shift forks.."      yeah yeah I'm getting older and fatter too....

[80-85 husky]

buy a big block auto...plenty of cushioining....

from what I have seen on similar threads, the special gear oils are plain oils with an "additive" to give a simulated higher viscosity with  simulated price increase that's real....

Briggs oil is fine, ive used both atf and briggs in the husky and kato with no dramas. shouldn't be payin much more than $10 a litre.

if you need some writing on a bottle to cushion your old gears, fine by me...

[Rossvickicampbell]

excuse the confusion here but what is the differences in grade rating?  Silkolene light gear oil is SAE75W-80 - Pentrite have recommended 10W-30 - obviously different scales?