The Silkolene Pro 4 Plus is the ultimate in fully-synthetic Ester Engine Oil specifically for Race Use Only.Synthetic ester technology to provide increased power4-stroke motorcycle engines performance and reliabilityExceptional film strength and outstanding surface protectionStart-up to maximum output in all ambient conditionsSignificant power output increase and outstanding reliabilityReduce wear of pistons, bores, cam lobes, followers and bearingsThe Silkolene Pro 4 Plus uses 100% synthetic ester technology to provide increased power, optimum engine protection, ultimate performance and reliability to four stroke motorcycle engines even under racing conditions. These specially researched synthetic esters provide exceptional film strength and outstanding surface protection from start-up to maximum output in all ambient conditions.Test bed and extensive racing experience in Superbike, Supersport and Superstock racing show significant increase in power output along with, outstanding reli