I've used Iso-HEET in gasoline vehicles with no problems. Why would Gold Eagle recommend Iso-HEET for diesels? When I study the details of diesel technology (fuel/water separators) and chemistry of alcohol bonding with water, it seems like a liability for Gold Eagle. Why I'm concerned and what I suspect happens is that alcohol (in Iso-HEET) bonds with the water in the fuel tank and creates (in effect) a larger molecule that could defeat the fuel/water separator system and continue to the engine, where, high pressure steam would form and eventually damage the fuel injectors. I would like to hear what you think, and possibly reach a better understanding.