What type of gas do you put in a 2006 3.6l Cadillac CTS
Ethanol free,is best,but you pay more at the pump for it,but it will run better in the car.
i'm using 91 in my 3.6.. gives good mpg.
I just used regular unleaded in my '12 CTS Coupe. Ran fine for me.
When I had a 2006 CTS w/ 3.6L, I ran Regular 87 Unleaded Fuel with an occasional tank of 91 Supreme or bottle of high octane additive (every 8- 12 tanks). Never experienced a problem. Currently, I have a 2011 CTS Sedan w/ 3.6L and I observe the same fueling guidelines. In our 2012 CTS-V Coupe, we run 91 exclusively. Hope that this helps.
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