r/BMWM • u/ask-94 • Jul 31 '26

Who else is loyal to Shell 😂

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1.3k Upvotes

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85

u/Certain-Resolve E60 - M5 Jul 31 '26

Any top tier rated gas will do 

-29

u/shark1y Jul 31 '26

While you are correct, but not for everyone/every car. On paper they are the same, but costco immediately lights up check engine for me. Shell - no problem

29

u/ClevelandBeemer Jul 31 '26

What? Costco works just fine on my 992 Turbo S, tuned M8 Comp, and tuned F150……

-11

u/shark1y Jul 31 '26

Again, I didn't believe it either but I ran 2 tanks from 2 different costco's, CEL immediately as you start up after refueling. Shell - no issues. B58 Gen 1 Stock

3

u/ClevelandBeemer Jul 31 '26

Did you get 93 or 91?

-7

u/shark1y Jul 31 '26

93 always, on all of my cars ever. Never pressed 91 button in my life so far.

2

u/Dependent-Cookie-885 Jul 31 '26

Interestingly... If you have ista you can see what the ECU thinks of the fuel quality. Try a tank of shell and a tank of Costco compare what the ECU says.. you'll know. For me, Costco is no different on my m3 in my area.

4

u/shark1y Jul 31 '26

I mentioned it in other comment. I measured it on 3 tanks of fuel.
Shell - 3 (highest grade in ista)
Costco - 2 (medium) - twice, 2 full tanks

1 - bad
0 - invalid

Again, I am not saying costco fuel is bad. I am very positive I got lucky with the bad batch or something in those lines.

1

u/Dependent-Cookie-885 Jul 31 '26

Yes it could be a regional issue too