Gamma V-Twin 20/50 Rock Oil Gamma is a premium quality mineral SAE 20w/50 4 stroke Engine Oil meeting the exacting demands of classic bikes and modern high performance m/cycle engine where a mineral oil is required. Gamma 20w-50 ensures maximum engine component protection and superior resistance to deposits and corrosion, resulting in extended engine life and optimum performance under the most arduous of conditions. It also passes the crucial clutch friction test required to meet the JASO MA specification , allowing safe , predictable use in wet clutch applications. Manufactured in the UK