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Old 08-06-2023, 07:10 PM
ard ard is offline
Join Date: Mar 2006
Location: Sierra Foothills, California
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Originally Posted by DeafM5 View Post
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?)
“Straight” gas?!?! Like not gay? Not unleaded?!?

Or just ‘unleaded gas without ethanol’?

Wont matter, IMO
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