How long does ethanol can damage my car?
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In modern cars designed for E10, using gasoline blended with ethanol for short periods (days or weeks) does not cause damage.
In older cars (pre-2000) or two-stroke engines, ethanol can cause:
Damage may appear after regular use of E10 for 3 to 6 months.
Ethanol damages cars by corroding metal components, deteriorating rubber and plastic parts, and separating from gasoline upon prolonged inactivity, forming a water-contaminated film.
The time it takes to damage varies considerably, but even several months of nonuse can cause significant problems, such as fuel pump failure or line blockages in older or incompatible vehicles.
Modern cars with ethanol-resistant parts are less susceptible, although their fuel systems still require maintenance, and incompatible vehicles can suffer damage sooner, possibly in as little as six months of exposure.