Oil additives are combinations of oil distillates and other chemicals that make engines operate more efficiently by freeing sticky valves, sealing piston rings, retarding oil breakdown, etc. They are usually a form of extremely heavy oil more resistant to change under high temperature so that viscosity (thickness) is maintained at high speeds.
Increased lubrication and sealing capacities are attributed to greater adhesion to engine parts. The additives are usually added to the oil and used under normal driving conditions. Oil additives are not cure-alls. They can improve engine performance by sealing leaks into valves and combustion chambers. They will prolong the life of an engine, but cannot repair serious damage.
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