Servo SYNLOCK 10, as the name refers to, is an artificial oil. Artificial oils are prepared from extremely costly base oils – base 3 oils. Base 3 oils are characterized by their peculiar composition which consists of above 90% saturates, 0.03% of sulphur and a viscosity index equal to 120. Base 3 oils are much more refined than Base 2, and undergo extreme hydrocracking, that is, are subjected to greater heat and pressure. The oil mentioned is a rarity in usage which in turn makes IOCL produce it in a meagre portion.