BEL RAY LUBRICANT H1-R Racing 100% Synthetic Ester 2T Engine Oil - 1L. (1) The ultimate 2-stroke racing engine oil formulated for all power valve 2-stroke engines Clings to metal to prevent wear in all 2-stroke applications Burns clean to eliminate carbon build up in combustion chambers and power valve mechanism Helps keep engines clean and responsive even under the most severe racing conditions