Mark wrote: << 20-weight oil can be hard to find, as it is too light for use in automobile engines. >> I may be wrong, as it has been a while since I got rid of my Yamaha, but I think 2-wtroke oil, while is mixed into the gas is generally 20 weight. YOu should be able to get it at snowmobile shops, small engine repair shops, bike shops, boat shops, etc. for about a buck and a quarter a quart. Bob Dixon