I just bought a new oil tank for my 2000 gtx. Big surprise it was leaking and split at the seams. Anyway I put all the old oil in a jug but I'm thinking I'd rather just replace it as I have no idea how old it is. I just bought the ski and am going thru the entire fuel system and replaced the oil tank. So whats the best/cheapest 2 stroke oil to get? Thanks.