I added this after and oil change and left room for the contents. I added while the engine was running. You could see and hear the engine smooth out and run better!
Poured 2 bottles in my Ram 3.0 eco diesel. My engine is running smoother and after 2000 miles Iβm not consuming any oil. I was 1 quart low at 2000 miles before using this. I would definitely recommend this product.