Silkolene Pro 4 10W-40 Fully Synthetic Engine Oil Silkolene Pro 4 is extreme performance Fully Synthetic Ester Engine Oil, made using XP Technology. It ensures the engine delivers ultimate performance & provides complete protection.Developed and designed on the race track for full on racers or weekend cruisers.Formulated to meet the needs of both air and water-cooled 4-stroke engines, Pro 4 10W-40 XP is the recommended SAE grade for the majority of motorcycle manufacturers.Specification: API SN JASO MA2 APPROVED. Up to 11% Fuel Savings. Up to 18% Lower Oil Consumption. Up to 3% Improved Power (BHP/TORQUE). New 4L Lube Cube - 100% Recyclable Packaging.