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Old 08-02-2023, 09:31 AM
DeafM5 DeafM5 is offline
Join Date: Feb 2019
Location: CT
Posts: 25
DeafM5 is on a distinguished road
I am not sure because of BMW's sensitive nature on O2 sensors. Cat does not degrade unless something caused it to fail in the first place. I will look into it, but it is very tight space under there due to AWD.

I am going to try straight gas and see if anything changes on X5.

is straight gas supposed to be running much more cleaner without any ethanol content?)
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