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CASTROL Part Synthetic Oil — advanced part-synthetic 4-stroke motor oil engineered for riders who demand reliable performance across engine, clutch and gearbox systems.
Combining synthetic blend chemistry with proven additives, CASTROL Part Synthetic Oil offers balanced protection and value—ideal for everyday riders and performance enthusiasts who want improved thermal stability, clutch feel and gearbox protection without the full-synthetic price tag.
Use: Recommended for 4-stroke motorcycle engines where a part-synthetic or semi-synthetic oil is specified. Check your owner’s manual for viscosity and specification match.