STP® FAQs

Find out everything you need to know about STP®, our history and our products in our frequently asked questions section.

What does “STP®” stand for?

“STP^®” stands for Science, Technology, Performance which reflects over 60 years of experience creating scientifically formulated products, using advanced technology to improve your engine performance.

Are STP® products safe for my car?

Yes. All of the STP^® products have been extensively tested and are safe for use in all cars. Always remember to follow the usage recommendations, which are clearly indicated on the label.

Can I use STP® products in my new car?

Yes. STP^® products can be used in vehicles of any age.

Will STP® products void my warranty?

No. All STP^® products undergo extensive testing to evaluate their performance and are determined to be safe for use in vehicles both new and old. Our products are specifically formulated to help improve the performance of the gasoline or oil to which they are added and will therefore help maintain the performance of your car.

Are STP® products safe for two-cycle engines? Four-cycle engines?

STP^® oil and fuel additives have been specifically formulated for use in four-cycle gasoline engines. Extensive testing in these engines has encompassed a broad range of passenger car usage and clearly demonstrated the value of our products in these applications. However, we have not evaluated the performance of our products in two-cycle engines. Therefore, we do not currently recommend that they be used for two-cycle applications.

Are STP® products safe for diesel engine systems?

STP^® has specially designed products for diesel engines, which have been labeled as diesel products. They have been thoroughly tested and evaluated in specific diesel applications to demonstrate their ability to help improve specific performance attributes of diesel engines and fuels.

How much do I use?

All STP^® products are individually labeled for dose and treatment intervals.

Can I use STP® additives with other products?

STP^® products are completely compatible with all other standard fuel and lubricant additives that are intended for similar use. However, mixing fuel or lubricant additives is not recommended, nor should it be necessary.