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Home » Engine Oil » Is STP Motor Oil Good? Should You Buy It?

Is STP Motor Oil Good? Should You Buy It?

Last Update: September 9, 2025 | Post By Josh Nader, BSc in Automotive Engineering Technology.
Chief Editor and Technical Writer at AutomoHub

Is STP Motor Oil Good

STP is a pretty popular brand for its wallet-friendly products. They have a wide range of products including synthetic oil, high-mileage motor oils, stop leak additives, engine treatments, cleaners, stabilizers, and 4-cycle and 2-cycle engine oils. 

There are many of positive feedback if you check through the reviews but still, it is a common question is STP motor oil good? Should you buy it?

So here is my honest review of STP motor oil so that you can make an informed decision.

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Is STP Motor Oil Good?

Different oil brands have different formulas that set them apart from the rest. So it is important to know what ingredients are used in STP motor oil. 

Motor oil is not just about lubrication. They have a bunch of additives to provide full protection to the engine. So here are the common elements of STP motor oil that provide you with a rough thought about its working process.  

  • Perfect Oil Viscosity Index: STP utilizes perfect oil viscosity that allows proper lubrication at high and low temperatures. It provides thicker lubricant layers that reduce wear and oil leakage into the combustion chamber. Therefore, it reduces oil consumption and smoke generation. 
  • ZDDP: STP motor oils feature ZDDP (Zinc Dialkyl Dithio Phosphate) which is an excellent anti-wear compound. It is a great additive that effectively reduces friction, heat, and wear. 
  • CERAMIC: STP Ceramic Oil Treatment uses Ceramic Si02 technology that adds a layer of protection to the engine. It prevents metal-to-metal parts friction and engine deposit formation. It works even after an oil change and gives protection up to 15k miles. 
  • Corrosion inhibitors: This protects the engine from water and acids formed from combustion gases in the crankcase.
  • Detergents: It is a vital element in the oil that keeps the fine contaminant particles (soot) suspended in the oil. Using a filter they can easily removed and prevent engine coating. 
  • Stop leak: These elements rejuvenate seals and gaskets so that minor oil leaks are sealed.
  • Smoke treatment: It is a specially designed additive that reduces oil burning and exhaust smoke. Motor oil also burns with fuel when it enters the combustion chamber. It feels the gap between the cylinder walls, piston rings, and valve guide seals. 

Who is STP Motor Oil good for?

STP Oil has a solid reputation in the automotive world for its ability to keep engines running smoothly. By reducing friction, preventing deposits, and enhancing fuel efficiency, it can contribute to the overall health and longevity of your engine. 

If you’re looking for a dependable motor oil, consider giving STP oil a try – you and your engine might just be pleasantly surprised. It is a good oil for both older and modern engines. 

Older engines have more metal-to-metal sliding contact parts than newer vehicles. ZDDP additive in STP motor oil ensures proper lubrication in those parts. Many synthetic oils like Valvoline are not good for older vehicles. 

STP oils provide maximum performance whether you are driving in extreme conditions. 

Moreover, STP motor oils are good for those who are looking for budget-friendly oil without compromising the protection and functionality. 

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Is STP Motor Oil Good For 4-cycle Engines?

STP has specialized motor oils for 4-cycle engines. It is a formula that is good for outdoor power equipment like lawnmowers, push mowers, tractors, etc. 

The oil features antioxidants, anti-wear technology, and detergents to bring out maximum performance from the 4-cycle small engines. 

It not only helps to run the engine but also provides excellent gas mileage. 

When it’s time to store your equipment seasonally, a corrosion inhibitor steps in to protect against rust and deterioration. This ensures your valuable machinery remains in top condition, ready for action when needed. 

Drawbacks

Well, STP motor oils provide a lot of benefits. Still, there are some drawbacks you should consider before buying it. 

STP oils are good for old engines due to their thick viscosity. But it is not recommended to use on the newer vehicles. 

As newer engines have variable valve timing and if you change the oil viscosity, it will greatly affect the engine performance.  

Frequently Asked Question

Who manufactures STP brand motor oil?

STP brand motor oil is manufactured by Spectrum Brands Holdings, Inc., a well-known company in the automotive industry. They offer a range of automotive products, including motor oil and additives.

What is the rating of STP synthetic oil?

STP synthetic oil typically carries API (American Petroleum Institute) certifications and ratings. The exact rating can vary depending on the specific product within the STP synthetic oil line. To determine the rating of a particular STP synthetic oil product, it’s recommended to check the product label or manufacturer’s website for detailed information.

What are the benefits of using STP oil?

Using STP oil offers several benefits for your engine. The oil provides excellent protection against friction, reducing wear and tear on engine components. It can enhance fuel efficiency by reducing engine friction, leading to better gas mileage.

Can you mix Valvoline and STP oil?

You can mix them but it’s generally recommended to avoid mixing different brands or types of motor oil. Mixing oils from different manufacturers can potentially lead to compatibility issues and may affect the overall performance of the oil. It’s best to stick with one brand and type of motor oil for your engine to ensure consistent and reliable performance.

Final Words

When it comes to taking care of your vehicle, one crucial aspect that should never be overlooked is the choice of engine oil. After all, your engine is the heart of your car, and using the right oil can significantly impact its performance and longevity. 

As per my personal experience, STP oil is a good choice for the engines, especially for the older engines. If you want to use it for the newer engines, then take a look at manufacturer recommendations. 

Filed Under: Engine Oil

About Josh Nader

Josh Nader is a dedicated automotive blog writer with a passion for Engine Oil that goes beyond the keyboard. Armed with a degree in Automotive Engine Architecture, he combines his writing skills with an in-depth knowledge of the automotive industry to deliver engaging and informative content.

Having immersed himself in the world of automobiles, Josh has cultivated a unique perspective on the latest trends, innovations, and technologies in the automotive landscape. His journey in the automotive industry includes collaborating with various automotive websites, where he has honed his ability to dissect complex topics and present them in a reader-friendly manner.

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