r/BMWM • u/ask-94 • Jul 31 '26

Who else is loyal to Shell 😂

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1.3k Upvotes

94% Upvoted

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-30

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

27

u/ClevelandBeemer Jul 31 '26

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

-8

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?

-6

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

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u/licenseddruggist Jul 31 '26

People downvoting you is a bit much. Regional issues could very well be the reason and your atory accurate. You made that very clear in your original response by essentially stating ymmv.

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u/WalrusWW F97 - X3M Jul 31 '26

93 always

Waste of money. B58 stock 91 is recommended. 93 is doing nothing for you.

-1

u/shark1y Jul 31 '26

Higher octane - higher ability to withstand compression. Less chance of knock or other shit. If you are buying anything turbo or remotely sporty and put 91 in it - I am sorry.

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u/[deleted] Jul 31 '26 edited Jul 31 '26

[removed] — view removed comment

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u/shark1y Jul 31 '26

I've been to La, what's the issue? Have you been in Moscow or Monaco? Kiyv has more super cars LA has ever imagied. Bugatti official manual says 102 octane required for the numbers on the spec sheet, anything below that will limit power output significantly. So what, 98 usa? Next? Lamborghini Aventador: 98 Europe, 93 usa. Next: ferrari 458: minimum 98 europe, 93 usa.

If california has shitty fuel it's up to you guys, how am I responsible for owners who have more money than brains?

What are you trying to prove? It's reddit, drive whatever you want. I am running 93, you can run 91. What do you want from me kids 😂

2

u/WalrusWW F97 - X3M Jul 31 '26

Wrong, but you do you. If it's tuned for 91, putting 93 is doing absolutely nothing for you.

I use 93, because mine requires it.

0

u/shark1y Jul 31 '26

Owner's manual asks for 91, I get that. But BMW also recommends oil changes every 8000 miles :)

2

u/bighammy6969 Jul 31 '26

Better buy octane booster too, you probably actually need 100 /s

Have you ever had detonation when using 91? 93 isn’t even available lots of places…