It is easy to use and requires no special mixing equipment or processing. Each of these types has a different processing requirement: Liquid Polymer Polymer is available in liquid, crumb, pellet and solid bale form. VI improvers make up around 10% of the content of a typical multigrade luboil, and increase the raw material costs of the finished product.
These provide a more stable viscosity and allow the formulation of oils with lower viscosity base oil (for easier cold starting) and yet which have adequate high temperature viscosity for engine protection.
The problems of temperature/viscosity instability are solved in multigrade luboils by the addition of Viscosity Index Improvers, made from various types of polymer, including:
