10W40 Semi-Synthetic Motor Oil. 1 quarter (946cc) bottle. JASO-MA. Formulated to resist oxidation, lower temperature and 'thin out' at high crankcase temperatures. Super smooth to reduce friction and increase efficiency at maximum speed. Designed to withstand the degradation from racing fuel contamination. Does not contain aggressive additives that can be harmful to the engine. For any application requiring a heavier engine oil, add Lucas Heavy Duty Oil Stabilizer (910407 mineral or 910408 synthetic) to achieve the desired viscosity.