Blended with premium base oils, select synthetic components and superior additive chemistry, PennGrade 1® V-Twin 4-Stroke Motorcycle Oil SAE 10W-40 is specifically formulated to offer the ultimate in quality, performance and protection for motorcycles. Unlike most other multi-viscosity motorcycle oils, the very unique viscosity modifier used in our PennGrade 1® oil is not based upon conventional polymers which can shear significantly with use and cause loss of oil viscosity. This viscosity modifier imparts exceptional High Temperature High Shear viscosity protection to our PennGrade 1® V-Twin 4-Stroke Motorcycle Oil SAE 10W-40 that is so critical for protection of high speed, high revving motorcycle engines. Further, in applications where the same oil is used for lubrication of both the engine and transmission, the excellent shear stability of this motorcycle oil offers a distinctive operational advantage over other less shear-stable oils. Increased levels of ‘zinc’ (zinc dialkyldithiophosphate) in PennGrade 1® V-Twin 4-Stroke Motorcycle Oil SAE 10W-40 provide exceptional anti-wear/anti-scuffing protection. Detergents, dispersants and anti-oxidants offer protection from thermal and/or oxidative oil breakdown that can lead to varnish and deposit formation. Anti-foam agents reduce oil foaming and air entrainment under high-speed and/or high-RPM operation