Years ago it was a common practice for many motorists to add a bottle of STP gas treatment to the tank right at the gas station with every fill-up. First-timers often acted on a recommendation from a trusted mechanic or simply from what they had heard from knowledgeable friends who were confident that the right fuel additives helped their vehicle run cleaner and maximize engine performance.

But over they years as cars and gasoline became increasingly more expensive, that habit has waned for many. Add to that what appeared to be a federal government caution on fuel additives/devices and many consumers may be disinclined because it suggests that use of these products could void your warranty.
But the fact is, the government's message to consumers is intended for devices only. The EPA says it does not test additives or devices for efficacy, and the use of after-market devices --not additives-- could void a vehicle's warranty: EPA info on fuel additives.

Norman Berke, chief scientist for STP, helps clear up any confusion. "I think the government website is for the EPA 511 Program a.k.a. “EPA Motor Vehicle Aftermarket Retrofit Device Evaluation Program”. The program is intended to evaluate fuel additives as well as mechanical devices intended for installation in the fuel air intake system of an engine in an attempt to improve fuel economy, performance or reduce emissions. They do take a negative view of products that make claims that “seem too good to be true” and go on to warn consumers about voiding their vehicles warranties especially with hardware to be added onto the fuel system.

Fuel system deposits are a primary concern for the auto makers and the EPA. Fuel system deposits are recognized as being responsible for reductions in fuel economy, drivability and increased exhaust emissions. At STP we test all of our products for their efficacy in controlling fuel system deposits using industry standard test methods with broadly accepted procedures. Our fuel additive chemistries are very effective at removing deposits on intake valves, fuel injectors and combustions chambers."

And the proof, he says, is something you can see for yourself. Click here to see the video demonstrating the ability of STP Complete Fuel System Cleaner to remove intake valve deposits: STP demonstration .