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Q: Should I be using ethanol in my 2006 Cadillac DTS?
on 2006 Cadillac DTS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Using 91 octane but with 10% ethanol.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Not a lot of choices. If no more than 10% should be ok! Easy test for eth.% if in doubt.
Let me know if you want to test your gas.
modern cars should be ok with 10% ethanol as most are designed, especially American cars, to run on the gasoline formula offered here. It's hard to find gasoline that do not contain ethanol thse days.

The problem arises with old cars that wasnt designed to run on ethanol and the ethanol interacting with fuel line seals that wasnt made to be alcohol friendly causing leaks in fuel system.

06 DTS should be fine. Granted, though you might notice a slight decrease in MPG as ethanol is not as efficient, although cheap to make from corn, as gasoline per power stroke of the engine. Take note though, unless it specifically says so i nthe owner manual, which I dont recall it stating the Cadillac DTS manual, DO NOT USE E85 (85% ethanol). But more than likely you already knew that but i have heard of that happening and it caused lot of headaches and a smiling mechanic as those Northstars are not cheap nor easy to work on compared to usual American motors.
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