The largest manufacturer is STP Corp. (for Scientifically Treated ... additives in improving the viscosity, or thickness, of oil—and can be bought at the rate of 920 a gallon.

Kind of like the old Andy Granatelli TV ads for STP Oil Treatment ... graphite or molybdenum that can settle during storage. Agitating bottles or buckets of gear oil helps re-mix the additives ...

the department's antitrust division filed a complaint against the carmaker — it ended production in 1966 — for fixing prices and allocating markets for motor oil additives, including STP oil ...

STP’s products include STP Oil Treatment, the company’s best selling product; as well as fuel additives, oil and air filters, a carburetor spray cleaner, antifreeze and motor oils. Sprick said ...

STP began life as Scientifically Treated Petroleum, then became Studebaker Tested Products when the Studebaker Corporation took over the company as part of its move away from car manufacturing in ...