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Originally Posted by gixxerboy63
I only run Shell 93 in my vehicles.
The lack of knowledge is exactly what scares me; A guy who regularly visits my buddy's shop swears by e85, yet he continues to have a check engine light issue every time he uses it.... go figure!
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In a X6/5M? How much is he running? Does he have a tune? If the long term fuel trims go over 20% the ECU will trigger a "to lean" fault. The air fuel ratio is fine but the ECU doesn't understand why it takes the extra volume of fuel to meet the AFR targets. It is because you need @30% more volume with ethanol to meet the AFR targets.
I've seen it numerous times on the stock tune when I add to much E85 in the mix. No impact to the motor.