2011 KIA Optima fuel additives

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KIA Optima 2011 3.G Owners Manual Introduction
41
Use of MTBE
KIA recommends avoiding fuels contain-
ing MTBE (Methyl Tertiary Butyl Ether)
over 15.0% vol. (Oxygen Content 2.7%
weight) in your vehicle.
Fuel containing MTBE over 15.0%