Addatives, work, the only thing that is not true is how long it will last in your engine, a one time treatment is not true, but as for adding treatments, I got a quart of the first stuff that penitrated the walls and they said u could run it with no oil, well it was from a customer from Rutgers that was doing a study on, it . so i used at the oil change, now my work trucks were old and leaked, and i was young with better things to do than check my oil, so i ran it dry,dont know how long, the job i was doing was 40 minutes one way highway, I thru a rod , hole in the block, it was still running being young and so its still running lets keep going, it went to work 3 more times dying on the third trip back at highway speeds, I do believe the addative worked, it was just like a later commercial, but for real, oil companies are not the only people in business and are not interested in controlling all other products, there are to many, as for all kinds of racing and the smart people that are coming up with things, it is impossible to say they are all peddaling snake oil, I have 30 years of all kinds of rigs, and many kinds of oil have extended the life of many a truck/jeep engine, lucas is a good one for sure. there are others. Randy