The natural multi-grade capability of esters often allows manufacturers to use less viscosity modifiers. Viscosity modifiers are the parts that break apart (shear) when highly stressed or in the presence of fuel dilution. These sheared viscosity modifiers are very volatile and are thought by many to be one of the primary components responsible for valve deposits in engines like the 2.0 FSI. Often viscosity modifiers are used to meet MPG targets or CAFE standards but may not be the best choice in terms of wear, shear, long drain capability (oils's ability to fight corrosive acids), etc. Other ester-based oils are Renewable lubricants Biosyn, Motul 300V, and Motul x-lite 0w30.