I have an 89 Grand Marquis and I'm wondering if using the "No Ethanol" gasoline in it would make it run any different because it is closer to what was available when it was new? It is a computer-controlled fuel injected engine. Also, what are your opinion of late 70's to late 80's Mercedes Diesels? If well-maintained, Do you think they are an exception to the endless money pits that the Merc's usually are? And whats it like maintenance wise to take care of one?