I have run e-85 tthrough many vehicles that are not specifically built for it, and still have yet to see any damage from it. I have had some vehicles that did not do so well on it, one being my Plymouth Voyager. But it has not suffered any damage from it, just started hard and the mileage sucked. But my sister has run it through their Escort every chance they get, and it got better mileage than on regular 10% mix. Same story on their Dodge Caravan, that is practically the same as my Plymouth. Can't answer why one of the same make and model will be so different, but it does happen. My mother runs it through her 02 Le Sabre, no problems, not even a check engine light, except when we were in Idaho, where they use potatoes instead of corn. It also has improved mileage, rather than lost.