What is the crankcase oil capacity for a 1980 Yamaha Enticer snowmobile?

I have an 1980 Yamaha Enticer 250 (ET250D). Here's what the sticker under the hoods says...

The oil capacity for the "Chain Case" is 15.21 oz (or 450 cc).

If you are talking about the engine crankcase, there is no oil in the crankcase of a two-stroke engine. It is lubricated by the oil that is mixed into the gas.

I am not sure what weight oil to use. The dealer told me to use Yamaha Chain Case Oil (but he didn't know the weight of the oil).

Hope this helps!