Best STP Engine Oil Additives of 2025

The STP Engine Flush is designed to keep your engine in top condition. It effectively removes harmful sludge and deposits, ensuring that your engine runs smoothly. While flushing, it protects the engine, preventing any potential damage. This product also helps to stop and prevent minor oil leaks, which can save you costly repairs. Additionally, it neutralises harmful acids, promoting a healthier engine environment. Using the STP Engine Flush can enhance the longevity and performance of your vehicle.

The STP Smoke Treatment is designed to enhance your petrol engine's performance and longevity. It effectively reduces engine wear, ensuring that your engine remains in excellent condition. Additionally, it provides extra protection, giving you peace of mind during driving. By reducing deposits, it keeps vital engine parts cleaner, which can enhance efficiency and overall performance. Furthermore, it fights oil oxidation and breakdown at high temperatures, helping to maintain optimal engine function even under demanding conditions.

The STP Engine Solutions set includes two essential products for your vehicle. The Engine Stop Leak helps to stop minor oil leaks and conditions engine seals, ensuring a smoother operation. It is compatible with both regular and synthetic motor oils, giving you flexibility in your choice. Additionally, it contains no solids that could clog filters or inhibit oil flow, providing peace of mind. This means you can maintain your engine's performance without worrying about potential blockages.

The STP Engine Flush is a 450ml product designed for both petrol and diesel engines. You can use it with every oil change, ensuring your engine stays clean and performs at its best. It is compatible with single multi-grade mineral or synthetic oils, providing versatility for various vehicles. By using this engine flush, you help remove harmful deposits that can build up over time, leading to improved engine efficiency and longevity.

The STP Diesel Oil Treatment is specially formulated for all diesel engines, ensuring optimal performance. It contains essential additives that are typically found in premium diesel engine oils, which means you can maintain a high level of engine care. When you use this treatment between oil changes, it effectively replaces burnt-out minerals and additives in your engine oil. This not only helps in keeping your engine running smoothly but can also significantly reduce your diesel operating costs over time.

The STP Oil Treatment is a reliable product designed to enhance your engine's performance. Its good quality ensures that your engine operates smoothly, providing you with peace of mind. You will find it easy to use, making it suitable for both novice and experienced users. Moreover, this product offers excellent value for money, allowing you to maintain your engine without breaking the bank. With STP Oil Treatment, you can trust that your engine will run efficiently and effectively.

The STP Diesel Treatment is a premium quality engine oil additive designed for ease of use. It helps enhance your vehicle's performance, ensuring a smoother drive. By using this product, you can improve fuel efficiency, which can save you money over time. It's also effective in reducing engine wear, promoting longevity for your vehicle. With its straightforward application, you'll find that maintaining your engine's health has never been simpler.

STP Engine Stop Leak is designed to address minor oil leaks in both petrol and diesel engines. Its unique formulation contains a special agent that helps renew polymer seals and gaskets, which can become damaged over time due to heat. This product is compatible with all motor oils and will not clog filters or affect engine components. By rejuvenating dried-out seals, it provides extra protection against leaks, ensuring smoother engine operation and potentially saving you from costly repairs.

The STP Engine Degreaser is an ideal solution for keeping your vehicle’s engine clean and efficient. It is suitable for a wide range of engines, including those in cars, lorries, vans, and tractors. This powerful degreaser penetrates deep to dissolve heavy dirt and stubborn deposits, ensuring a thorough clean. By using this product, you can maintain optimal engine performance and prolong the lifespan of your vehicle, making it a valuable addition to your maintenance routine.