The PA—Product Approval Protocol Task Group (PAPTG) is a separately funded task group of the Petroleum Additives Panel that focuses research and advocacy efforts related to automotive lubricant additives. PAPTG member companies are active developers, manufacturers or marketers of performance enhancing chemicals for use in automotive lubricants. Typical performance enhancing chemicals include:
Viscosity Index Improvers (VI Improvers)
VI improvers are used to so the oil does not become too thin when heating or too thick when cooling. Three major types of VI improvers include: ploymethacrylates (PMAs), ethylene-propylene copolymers and terpolymers (OCP) and hydrogenated styrene-isoprene block polymers (HSP). Additionally, polyisobutylenes (PIBs), styrene-polybutadiene (SPB) and styrene-polyester (SPE) have been used commercially.
Dispersants are used to control sludge build up. Three types include: succinimides, succinate esters and mannich-based (beta-amino-ketone) products.
Detergents neutrilze acid formed from oxidation of sulfur. Three types include sulfonates, phenates and salicylates.
Prevent metal to metal wear. Zinc dithiophosphate (ZDDP) is most well known antiwear agent. Dithiocarbamates and molybdenum disulfide are other types.
Prevent minimize varnish and sludge. Types include ZDDP, hindered phenols, alkyl diphenylamines and substituted phenylene diamines.
Fatty acid derivatives and molybdenum disulfide
N,N-disalicylidene and 1,2-propanediamine
Alkenylsuccinic anhydrides and dinonylnaphthalene sulfonates