1980 Kawasaki Invader 340

[jimvw57]

The motor gearcase holds around 40cc of oil. Most use the same oil they use in their car as they then have a use for the leftover oil. Same for the ATF, It doesn't really matter as it is used as a lubricant and not as a hydraulic fluid, plus there are not any clutch or bands to worry about. Get whatever is on sale.

Snowmobile oil is much thicker and is made to be mixed with gasoline or injected (still mixed with gasoline) Use synthetic if you want but it is a bit spendy.

[Invader440]

Personally, I like running 5W30 in the gear case but that's just me.

[ChaChi]

I do think there are better things to run in a chain case then ATF. It works well because it's nice and thin and has good lube properties, but the friction inhibitors in it aren't really designed to protect a chain and sprocket, I know the manuals all say to run it, but a proper chaincase lube is better...

Cases aren't as picky as my thinking about it tho and ATF is cheap and usually helps old seals do there job! As long as oil is in there and it isn't 80weight ur good!

[Checkmarks]

ATF is run in Chevy transfer cases around the world and by the millions.  If a person has had the opportunity to open transfer cases there are chains and gears in them. 

I run ATF in my chain cases.