Originally Posted by Pot of gold
1994 Coach House 192SD, Dodge V8 360.
Around town 9.6, Highway 15.4
I use a fuel additive because the use of 10% ethanol can ruin the fuel system of early pre-2000 units. The additive might positively affect fuel mileage.
I have a 96 Buick Roadmaster that I got about 10 years. I don't know what gas it had in it for it's entire life in Texas and Idaho mostly with a couple of years in St Louis. It had ethanol fuel in it when I picked it up in St Louis and drove in home to the Minneapolis are.
It ran fine bringing it home, but I did soon switch to no ethanol premium which is available for classic cars here. Expensive but probably worth it.
I did a complete rebuild of the entire drivetrain and fuel system of couple of years ago, including cleaning out the fuel rails and injectors plus I replaced the fuel pump, sending unit and fuel pressure regulator. None of it was severely corroded at all which was a big surprise as I heard all vehicles pre 2002 would be affected. The only bad part I found was the worn and slightly corroded brass sending unit float reostat.
I do know that E10 is a killer for all small engines so I run the non ethanol gas in them also and some are 30 years old without being touched at this point. I routinely here of folks having continual issues with their small engines and they are too cheap to buy the good gas for them and spend more getting them fixed.
As to the fuel stabilizers for E10 damage prevention, there seems to be some mixed messaging between the multiple "test" I have seen run by online people. The manufacturers of the products insist it is great, most reviews that actually tested reasonably well say the preservatives don't do much of anything except prevent some gas gelling. Here is one Utube sample of the testing type I have seen.
I have to assume my Buick didn't see a lot of E10 over it's like due to how it all looked, but have no proof of that.
I really don't know what to recommend for the older vehicles if you can't get non ethanol blended gas if the additives don't work.