i know i read up loads on there before buying any, no real conclusive evidence, dont thinnk my motor was all that well looked after before m,e so thought id treat it to some,
i think if you can use super duper diesel you dont need it, but as there is nowhere near me within 15 miles that i can get any I can only get supermarket fuel, so every 5k miles ill stick a bottle in just to help it out