Lucas Primary Chaincase Oil Is A Blend Of Easy Flowing Base Oils And A Lucas Additive Package Designed To Carry Away More Heat From The Clutch Plates And Friction Plates. This Assures A Longer More Trouble-Free Clutch Life. Expect A Smooth Clutch Action, Less Slippage, Longer Chain And Sprocket Life And A Much Longer Oil Life. Is A Heat Transfer Fluid For The Clutch As Well As A Lubricant For The Chain And Sprockets. Key Benefits Cool &Amp; Quiets Designed For Heavy Duty High Performance Situations Meets Or Exceeds All Oem Requirements