i am out done with how will Cerma works... i haven't used it for one year ago; i mistaken had oil changed with conventional oil. once i received my my products, i change out the old with Cerma. Immediately i notice the power of the engine was BACK! Prior to this oil change, I've used the engine treatment & oil according to procedures. treatment 1500miles or better then change the oil wi Cerma. Big Ups to the creator of the product. p.s. i never stop using the gas treatment