Synthetic oil for 4-stroke V-Twin engines with non-integrated gearbox, with and without catalytic converters. A high viscosity hydrocracking base that resists overheating and viscosity loss and an advanced additive package protects against wear, keeps the engine clean and extends engine life. Designed for Harley-Davidson engines, including extreme operating conditions in V-Twin and similar air and water cooled engines. A high flash point of 260°C and extremely low volatility reliably protect the engine under extremely difficult operating conditions, traffic jams and high speeds.