Date registered: Jan 2004
Vehicle: 1986 560 SEC
Location: NW Ohio
Mentioned: 0 Post(s)
Quoted: 9 Post(s)
RE: Use of Ethanol blended petrol
Ethanol has higher octane than gasoline, and that is often the reason for the commonplace 10% Ethanol blends.
The problem is that Ethanol will attack most rubber and plastic parts of your fuel system and shorten their life or cause them to fail abruptly.
Common problems caused by ethanol are carburetor gasket failure, carb float failure (if plastic), stress-cracking of vacuum tubes and fuel lines, and etc. Blends of 10% or less are considered safe for these parts because the ethanol concentration is low, but the damage still can occur.
New Betty: 1982 300TD 58,000 miles
Old Betty: 1983 300TD 315,000 miles, RIP
1986 560 SEC RIP
1984 500SEL RIP
2000 ML350 ugh