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Any high quality racing oil from a kart shop will work just fine but use a ratio of 16:1 which is 8 ounces per gallon of gas which can simply be high test from the gas station.
Castor oil should not be used below 50 degrees F. The best oil I have found for all engines and conditions is Red Line Two Stroke Kart Oil.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience