Originally Posted By: Bruce T
I wouldn't be surprised if gasoline with 10% ethanol causes LESS damage to engine oil. Ethanol is higher octane than gasoline, burns cleaner, cleans the fuel system, works as anti-freeze in fuel lines, and absorbs water. Yes, mileage with E10 is about 3% worse. So what? Driving style makes a 30-40% difference.
I agree. A 5000 mile OCI in my Grand Caravan on strictly E85 will NOT turn the oil black. It comes out just a shade darker than when it goes in. I assume that is from less fuel soot, due to less carbon based fuel (gasoline) being used.