Engine detonation refers to spontaneous combustion of the remaining fuel/air mixture in the chamber after normal spark-initiated combustion.
Most fuel additives aren’t formulated to provide immediate results. AMSOIL P.i., however, is a potent fuel-injector cleaner proven to work after one use.
What’s the difference between AMSOIL P.i. Performance Improver and AMSOIL Upper Cylinder Lubricant? One’s a deep-clean product, the other a keep-clean product.