![The One-Two Punch: AMSOIL P.i.® and Upper Cylinder Lubricant](https://blog.amsoil.com/wp-content/uploads/2023/11/Blog_1200x675.jpg)
These fuel additives work together to help keep your vehicle running at peak power and performance.
![Do Fuel Additives Work?](https://blog.amsoil.com/wp-content/uploads/2019/10/Pi_Valves_1200_px.gif)
As the data show, AMSOIL P.i.® is a potent fuel-injector cleaner that works after one tank of fuel.
![What is Engine Detonation?](https://blog.amsoil.com/wp-content/uploads/2021/07/Glowing_Car_Engine_1200px.jpg)
Engine detonation refers to spontaneous combustion of the remaining fuel/air mixture in the chamber after normal spark-initiated combustion.
![The Dynamic Duo: AMSOIL P.i. & Upper Cylinder Lube](https://blog.amsoil.com/wp-content/uploads/2019/10/DynamicDuo.jpg)
What's the difference between AMSOIL P.i. Performance Improver and AMSOIL Upper Cylinder Lubricant? One's a deep-clean product, the other a...