Penrite four stroke Enduro HD oil [ NOTE: was Enduro now called Enduro HD] , 25W -70 non-friction modified four-stroke mineral oil, API SF API SG. RRP $63.99. Primarily recommended for use where SAE 40 oils were specified. Also suitable for wet clutches. High Zinc content. May be used in Classic British motorcycles including single cylinder 350 to 500cc low revving engines and 500 to 650cc parallel twins. Enduro is primarily recommended for use in pre 1980 motorcycle engines where SAE 40 & SAE 50 grade engine oils were specified. It is also equally suitable for use in transmissions with wet clutch systems where engine & gearbox oils are combined. It has optimum clutch slip prevention in these systems. Ideally suited to cast iron engines and ambient temperatures in Qld and northern Australia. See the Penrite website for MSDS and specifications.