Motor Oil Info

Typically, a type of additive called Viscosity Modifier (VM) or Viscosity Index Improver (VII) is added to the base oil to achieve multigrade performance. These types of organic polymer additives thicken the oil at high temperatures while having a minimal thickening effect at low temperatures. The addition of a viscosity modifier allows for the use of lower viscosity base oils to achieve the cold temperature requirements. The use of light weight petroleum oils increase oil volatility (burn-off), contributing to excessive oil consumption and oil thickening.

AMSOIL Heavy Duty Diesel Oil (ACD) and Small Engine Oil (ASE) meet multigrade viscosity requirements without the use of viscosity modifiers. This is accomplished through the use of naturally high viscosity index, wax-free synthetic oils. These oils meet both the low temperature requirements of SAE 10w and the high temperature requirements of SAE 30. Thus the products are true SAE10w-30 and SAE 30 oils.