SMOKING OIL provides BETTER LUBRICATION than an oil that is advertised that DOESNT SMOKE!!!! PEOPLE just assume that an oil that doesnt smoke is a good oil!!! the MFG even ADVERTISES IT!!!! You see how unintelligent a LOT OF PEOPLE ARE??? ITS A 2 STROKE SNOWMOBILE!!!! IT'S SUPPOSED TO SMOKE!!!! Its like buying a waverunner that DOESNT FLOAT!!!!!! 2 stroke oils USUALLY have a jaso or a tcw or tcw-3 certification.. BUY THESE OILS!!!! there are 2 stroke oils out there that do not meet the specs!!!! Dont waste your money.. NOTHING BUT TROUBLE!!!! You could buy Citgo or Texaco brand for a LOT LESS than YAMALUBE and you'd be getting the EXACT SME OIL from the EXACT SAME VAT!!! Citgo makes yamalube,, along with a DOZEN other brands.. They do not have a MAJIC pill that they throw in when they pump it into those quart or gallon BLACK bottles.. its the same stuff as all the other brands citgo sells!!! SYNTHETIC OILS work FAR BETTER than conventional oils do.. an OIL THAT SMOKES MORE actually LUBRICATES BETTER!!!! I use MOTUL brake fluid in my race car.. dot 5.1 about 8.00 for 1/2 litre!!! compared to 99 cents for dot3!!! YOU DO GET what you pay for.. I use KLOTZ in ALL my 2 stroke stuff!!! Not just my sleds!!! Gary Oles nosboy