Gro gearbox racing oil is a premium, mainly synthetic lubricant designed for all racing and high performance motorcycles. The thermally sensitive construction of gro ensures optimum performance in all conditions and has extremely low drag characteristics, whilst retaining outstanding resistance to severe shock loadings that occur under racing conditions. GRO is suitable for all high performance transmission systems where an SAE 10w40, 20w50 or 30w lubricant is recommended