sfarmer

Question here for you guys about the behavior I'm seeing when I run 87 octane gas for long haul trips. Since we're paying over $3.45 a gallon for 91 octane, I'll use the cheap stuff when I know I'll be blowing through a tank fairly quickly. Once in a while the Engine Check light will come on, but will go back off when I put 91 octane back in.

Has anyone see this behavior before? What is the real reason here? I don't have a diag tool to pull the error code, but was just curious if anyone had any insight.

Thanks.

4Driver4

May not even be fuel related if you drive differently with the different grades.

THM

i never use lower then 93, its not honda

InnyAudi

I put in mid-grade every once in a while with no problems...

All Wheel Driver

What are you really saving? $3.50 a tank full?

How many tanks are you going through on your long trips?

audikillsbmw

I used to use 93 all the time... no check engine lights so far. I'm guessing it's a different story for FI engines though...

audikillsbmw

Didn't you say that you were getting new wheels? : )

InnyAudi

Got some RS4 replicas off ebay... and I gotta say I'm impressed so far with the quality. Out of the box they had a beautiful finish... and so far so good with durability... have pounded plenty of pot holes...

Next mod? cutting my valance and putting on some Magnaflow tips... soon!

audikillsbmw

Cool...: )

VR_Life

2.7t shouldn't be run on anything less than 91oct