Single rail gear oil recommendations.

[NZXD 2,328]

Evening team.

 

Im after peoples choice of oil for the single rail. Ive had mine rebuilt and had various types of advice on oil.

 

The book states ESW-M2C37 SAE 30 at 1.87 litres. What is the equivalent?

 

Cheers

[PRO250 1,506]

20/50 engine oil

[NZXD 2,328]

Yes that was one recommendation, along with 20/40.

 

I also read people using auto fluid mixed with engine oil in top loaders.

[gerg 10,871]

I've gone 80W-90 and ATF before, worked well. A light gear oil would work too (say grade 50) or if you can get hold of some ST50 Detroit Diesel engine oil, works well too, that's also spec'd for some jap truck boxes. I tend to think that plain old engine oil isn't up to the task of lubricating gears under load.

[NZXD 2,328]

I've gone 80W-90 and ATF before, worked well. A light gear oil would work too (say grade 50) or if you can get hold of some ST50 Detroit Diesel engine oil, works well too, that's also spec'd for some jap truck boxes. I tend to think that plain old engine oil isn't up to the task of lubricating gears under load.

 

What about straight 80w-90?

[gerg 10,871]

What about straight 80w-90?

 

The syncros won't like it. The EP anti-friction component in gear oil means your syncros won't grab and you'll get slow, baulky gearchanges. Thinning it down with ATF allows them to work much better.

[ando76 4,354]

I ran straight 80-90w in the race car - but as gerg pointed out the shift is not pretty.  I only ever changed from 1st to 2nd so it was not a big issue but in a road car it would be.

 

I went to Valvoline Durablend 80-90w gear oil and the shift improved out of sight and the oil stayed cleaner longer.  The actual physical weight between the mineral oil and the Durablend was noticeable. 

[OGRE 2]

I deal in selling oils as a wholesaler.

 

I use a universal tractor transmission hydraulic oil. Its illegal (well here in NZ) to be used on the road as it has no colour. But it works great.

 

Is equivalent to a 10w30 (SAE30 pretty much) Benefits are that is has a wet brake additive which is a friction modifier. Gets those synchros gripping real well.

 

Another option is motorbike engine oils that are made for the wet clutch as well. Has the same friction modifiers.

 

Next best option would be a GL4 75w90.

[xe1984 64]

20/50 was all I used.

[NZXD 2,328]

I deal in selling oils as a wholesaler.

 

I use a universal tractor transmission hydraulic oil. Its illegal (well here in NZ) to be used on the road as it has no colour. But it works great.

 

Is equivalent to a 10w30 (SAE30 pretty much) Benefits are that is has a wet brake additive which is a friction modifier. Gets those synchros gripping real well.

 

Another option is motorbike engine oils that are made for the wet clutch as well. Has the same friction modifiers.

 

Next best option would be a GL4 75w90.

 

Cheers for the input, where in NZ are you located? I'm in Wanganui.

[OGRE 2]

Im in Rotorua but originally from Palmerston North. Been to wonderful Wanganui enough times though 

[NZXD 2,328]

I'm always talking about leaving wangas, but never happens. Very affordable place to live....