Fully synthetic 4-stroke motorcycle engine oil. Formulated with 100% synthetic base fluids and the latest additive technology for maximum performance in 4 stroke motorcycles. Designed for motorcycle engines and transmissions where maximum performance is required. ZFS 10w40 has been specially developed for both road and track use in both air and water-cooled motorcycles.Constant high friction profile for wet clutch performance exceeding the JASO MA2 specification.A fully synthetic base oil and special additives to give high temperature endurance.Suitable for use in machines fitted with oil immersed wet clutches.Designed specifically for 4 Stroke engines providing a cleaner, and therefore, improved operation preventing excessive valve train-wear and offering excellent oxidation resistance.