Hey guys! I just bought a sled. Im 29 and this is my first so I dont no much about them. I bought a 1989 yamaha exciter 570. Its in very nice condition and has 5214 miles on it. Anyhow under the hood Is a oil tank, not the 2 stroke oil tank, but a bigger tank and the lid on it says oil. What kind should I put in it? What kind of oil Is this? Is it gear oil or something? Thanks!