Belray 99550B4LW Works Thumper Racing Synthetic Ester 4T Engine Oil 10W50 4LDescription for Bel Ray Works Thumper Racing Full Synthetic Ester 4T Engine Oil 99550 B4LW Developed for full works competition use Withstands extreme racing conditions and the highest temperatures and stresses a person can put on a bike Meets API SM and JASO MA2 specifications Will also work with air cooled liquid cooled 4 stroke engines and wet clutches Sold each Product Specs for Bel Ray Works Thumper Racing Full Synthetic Ester 4T Engine Oil 99550