Rotella in just the trans, or in the case of my XCF, engine and trans as they are not seperate like the EXC and XCW's. Mobile one synthetic ATF in the clutch system IE master, slave cylinder and line.
On the mini KTM's we have rekluse's and we are running the Rotella 15-40 in the gear box/clutch. Synthetic Rotella in my XCF with standard clutch.
The oil comes out looking good, the clutches work great and there is minimal stuff of the plug. About $13 buck a gallon, about $20 for the synthetic. I see no need for synthetic is the gearbox only but I like the thought of it in that high dollar XCF engine.
PS Back bleeding the clutch line is a pain if you don't have the right stuff. An alternative is opening the bleed screw a couple of turns at the slave cylinder and keeping the master cylinder full as it runs out the bottom. Air will want to run up the line, that is why they say back bleed but gravity will pull the fluid down faster then the air can migrate up IME. So it will purge out the bottom, just don't get distacted and let the master cylinder run dry....or you will be starting all over with a bunch of air in the system (I don't want to talk about how I know this). Same method works great for front and rear brake system, just let the gravity do the work and you will see when fresh fluid is coming out your done. A piece of clear hose pushed over the bleed fitting lets you see what is coming out and direct it to a catch can.
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