Actually you'll want to use a gear oil. Like a 75w90. It doesn't take much oil so using some Mobile 1 75w90 synthetic gear oil won't break the bank and it'll stand up to moisture a little better than plain gear oil.

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I was on a long weekend ride when I developed a large chaincase leak. Only thing I had available was the 2 stroke oil I carried. It worked for the duration of the 600 miles of the trip until I got back home.
If this is a backup sled, getting little use, any oil will work.
But why not just use what SkiDoo sells? There is little economic reason to use something else, the savings amount to the cost of 2-3 gallons of gas. How often will you change the oil? Every few years? So over the life of the oil, it costs an extra $2 per year. Not much considering how expensive everything else in sledding costs.

 

I believe Doo uses 75w140 these days.

 

There's nothing scientific about a chaincase. In a snowmobile application all you want to ensure is that at -20F the oil isn't molasses and it has good moisture tolerance. One of the best oils I know of for this is John Deere Low Vis Hyguard. A marine gear oil would also be a good choice if the cold viscosity is right.

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Amsoil Server Gear 75w 140. You get enough in bottle to do 2 changes.

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As above- you can use pretty much anything in there.

 

Good old ATF works great and is cheap.

 

Gear oil. I use a full synthetic 75/120. it's just a chain and gears... pretty much any kind of oil is good.

 

I use Amsoil Chaincase Oil...

 

As far as running any oil no, with todays high hp. sleds there isn't a lot of oil in the chaincase. The oil will break down more quickly if you are not running a good high viscosity such as 75/90 full synthetic or even 75/140 full syn. Also check that they have the EP additive which stands for extreme pressure.(most top brands do). I see a lot of guys run atf??? Would you run atf in your rear diffs in you cars or trucks(no). Also all the new full synthetic gear lubes pour quite well in sub zero temps. Will it slow you down? No. It warms up very quik. So go spend $10-$15 on a good brand of full syn gear lube. The chain, gears, and even chain case plus labor can be very costly when things go south and down time. When I see guys chincing out the major drive system on your snowmobile I have to chuckle cause sooner or later you will pay. Hey but you saved 6-8 dollars buying cheap oil.

 

As far as running any oil no, with todays high hp. sleds there isn't a lot of oil in the chaincase. The oil will break down more quickly if you are not running a good high viscosity such as 75/90 full synthetic or even 75/140 full syn. Also check that they have the EP additive which stands for extreme pressure.(most top brands do). I see a lot of guys run atf??? Would you run atf in your rear diffs in you cars or trucks(no). Also all the new full synthetic gear lubes pour quite well in sub zero temps. Will it slow you down? No. It warms up very quik. So go spend $10-$15 on a good brand of full syn gear lube. The chain, gears, and even chain case plus labor can be very costly when things go south and down time. When I see guys chincing out the major drive system on your snowmobile I have to chuckle cause sooner or later you will pay. Hey but you saved 6-8 dollars buying cheap oil.

You are right, I would not run atf in my differential with gears inside, but I do run it in my transfer case that has the same type chain drive as my sled. The worlds largest manufacturer of HYVO chains says atf is ok lube, good enough for me.

 

I used synthetic transmission oil in my 07 Renegade 800HO for the sleds whole life which was over 11,000 miles. Chain case was never touched except annual fluid spill and fills. Too bad I can’t say the same for the engine.

 

Synthetic 75W-90 is readily available its not expensive. It will work just fine. Basically that's all the Doo oil is. It may have additives to help emulsify water. I have a bottle of Ski Doo chain case oil and a bottle of Sea Doo jet pump oil and they're the same stuff. Lucas makes a Marine Synthetic 75W-90 fear lube that has additives to handle water. John Deere HyGuard has an excellent additive package in it. It's the oil used in the trans/rear end/hydraulics of their equipment. Good enough for a 620HP 9620R that produces a quadrillion tons of draw bar pull and has like a 60 or 90 gpm hydro pump in it.

ATF will work as well but it won't take water as well. Water is the killer. And yes you will get water inside your chaincase.

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thank you all that replied went to Wal-Mart syn. 75-90 qt for 6.97 will be good for my 08 and 06 sleds

 

Should work. I use Walmart Super Tech 75w-140

The BRP oil history is:

413 801 900 Mineral 75W-90 GL-5
413 801 900 Mineral 75W-90 GL-5
293 600 043 Synthetic 75W-90 GL-5
413 803 300 Synthetic 75W-140 GL-5
293 600 138 Synthetic

 

I was on a long weekend ride when I developed a large chaincase leak. Only thing I had available was the 2 stroke oil I carried. It worked for the duration of the 600 miles of the trip until I got back home.
If this is a backup sled, getting little use, any oil will work.
But why not just use what SkiDoo sells? There is little economic reason to use something else, the savings amount to the cost of 2-3 gallons of gas. How often will you change the oil? Every few years? So over the life of the oil, it costs an extra $2 per year. Not much considering how expensive everything else in sledding costs.

Correct. The oil gets hot due to exhaust proximity Needs the 140W

 

thank you all that replied went to Wal-Mart syn. 75-90 qt for 6.97 will be good for my 08 and 06 sleds

YES