All right, I've got a question.
A bit of background: Yamaha makes a side-by-side called a YXZ1000r. The machine has a split sump between the transmission and engine: they don't share the same oil.
The transmission is a sequential dog box transmission with a wet clutch. Yamaha just states to use the same oil in the transmission as in the engine (API SG or higher, JASO MA) [Off topic: I don't know why they suggest a JASO MA oil in an engine sump that has no wet clutch, but maybe its just to prevent the servicer/owner from putting the wrong oil in the transmission?]
I can understand the JASO MA specification for yamaha to at least address a wet clutch.
The way I am seeing the transmission is that, being a sequential dog box transmission, what is needed to serve it is a GL-4 minimum benchmark.
Based on your knowledge and formulation experience, how would some of these perform in that sump with respect to the clutch and gear wear control:
1. conventional or synthetic GL-5 gear oil (boutique or off-the shelf)
2. conventional or synthetic synchromesh "MTL" GL-4 gear oil
3. Universal Tractor Hydraulic Fluid (UTTO) "for use in applications that call for GL-4 [and a listing of many others]"
As far as I can interpret and understand:
The GL-5 and GL-4 gear oils will definitely uphold the gear wear protection. I don't know their typical or relative performance for clutch frictional performance, nor if there is anything in either's usual/conventional formulations (off-the-shelf) that would outright chemically attack the clutch. To my knowledge, there is no specification for clutch performance in gear oils, but at the same time, I have a hard time believing that there is no prior history in decades past that we have used a wet clutch transmission and tried to tackle managing both with some kind of gear oil formulation, or where that development went. Probably a good intro to where I went next, which is below
Universal Tractor Hydraulic Fluids--these are pretty much a new wild card for me. All I have is statements on Traveller or Supertech bottles that say "for use in..." instead of "meets" and I don't know if I should trust the terminology to imply that it upholds a GL-4 level of protection. I would think that if there is anywhere where such a sump commonly exists, it would be the tractor or industrial machine realm.
A bit of background: Yamaha makes a side-by-side called a YXZ1000r. The machine has a split sump between the transmission and engine: they don't share the same oil.
The transmission is a sequential dog box transmission with a wet clutch. Yamaha just states to use the same oil in the transmission as in the engine (API SG or higher, JASO MA) [Off topic: I don't know why they suggest a JASO MA oil in an engine sump that has no wet clutch, but maybe its just to prevent the servicer/owner from putting the wrong oil in the transmission?]
I can understand the JASO MA specification for yamaha to at least address a wet clutch.
The way I am seeing the transmission is that, being a sequential dog box transmission, what is needed to serve it is a GL-4 minimum benchmark.
Based on your knowledge and formulation experience, how would some of these perform in that sump with respect to the clutch and gear wear control:
1. conventional or synthetic GL-5 gear oil (boutique or off-the shelf)
2. conventional or synthetic synchromesh "MTL" GL-4 gear oil
3. Universal Tractor Hydraulic Fluid (UTTO) "for use in applications that call for GL-4 [and a listing of many others]"
As far as I can interpret and understand:
The GL-5 and GL-4 gear oils will definitely uphold the gear wear protection. I don't know their typical or relative performance for clutch frictional performance, nor if there is anything in either's usual/conventional formulations (off-the-shelf) that would outright chemically attack the clutch. To my knowledge, there is no specification for clutch performance in gear oils, but at the same time, I have a hard time believing that there is no prior history in decades past that we have used a wet clutch transmission and tried to tackle managing both with some kind of gear oil formulation, or where that development went. Probably a good intro to where I went next, which is below
Universal Tractor Hydraulic Fluids--these are pretty much a new wild card for me. All I have is statements on Traveller or Supertech bottles that say "for use in..." instead of "meets" and I don't know if I should trust the terminology to imply that it upholds a GL-4 level of protection. I would think that if there is anywhere where such a sump commonly exists, it would be the tractor or industrial machine realm.