As a general rule I don't use fuel additives, but when I do, it's what the manufacturer recommends at least till the end of the warranty. My John Deere dealer recommend this fuel treatment that's supposed to lubricate the injectors and the injector pump, that's made by .......John Deere. My philosophy is use all the recommended oils, antifreeze, fuel treatments, and consumable parts from and recommended by the dealer who would be handling any warranty claims. After the warranty period is up, decide what you want to do. I like my dealer to smile when he sees me coming, and hopefully remember the extra money I spend if there's a problem that should be covered under warranty.
Ted