A friend of mine is raving about "mechanic in a bottle"
Have any of you folks tried it?
Does it differ in any meaningful way from things like "Wynn's Diesel Particulate Filter Cleaner"?
Does regular use of either of the above mean that there is no need to buy the more expensive/premium types of diesel?
(e.g. Esso's "Supreme+ Diesel", BP's "Ultimate Diesel" etc)