Protec Internal Engine Cleaner | Engine Flush DETOX4&reg; Cleans the entire oil lubrication system to restore acceleration and engine performance. Removes contamination from piston rings and valve seals to reduce engine smoke. Protects valve seals, lifters, and camshafts (removes engine ticking noise). Boosts engine compression to restore gas mileage. Forms a long-lasting protective coating to reduce heat and friction.