Semi-synthetic engine oil for 4-stroke motorcycles. Motorcycle 10W-40 is suitable for touring, racing and cross bikes and offers excellent protection against wear, deposits, sludge and oxidation. Oil-thickening and oil consumption are kept to a minimum. The sophisticated formulation offers an excellent protection to gearboxes where an API SF/SG or SL oil is prescribed. The oil does not contain friction modifiers and can be applied in wet disc clutches, preventing from slippery and sticking clutches.