yes it is expensive but afer two years of racing my warrior i have seen the diffrence between good oil and average oils. at firt i tried auto oil but after one one hour race the oil was crap, plus the bike lost powerr and didn't shift well. then i tried klots syntetic oil and didn't like that at all either. but when i tried the yamalube and the honda GN4 i could't belive th diffrence.plus i can go 2 to 3 races now and the oil is still in better shape than normal oil. my next step its the top motul oil in a 10-60 weight. it runs about 15 per quart retail but i'm luck to have a great local shop that sponsers me and gives me a discount.

 

polaris synthetic 2 stroke injection oil $28 a gallon, Rotax marine synthetic 2 stroke injection oil $8 a gallon at walmart, NO difference