Costco 91 Octane in F10 - BMW M5 Forum and M6 Forums
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post #1 of 4 Old 4th May 2019, 11:17 PM Thread Starter
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Costco 91 Octane in F10

Does anyone where put Costco 93 octane in their F10 M5? I tried it once when I had my e39 M5 and noticed slight loss of performance so wanted to see if anyone uses it on their F10 and if so, if you have noticed any loss in performance or reduced gas mileage?
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post #2 of 4 Old 5th May 2019, 12:11 AM
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I regularly fill up with Costco 93 octane with my E39 M5 and have never noticed a drop in power.
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post #3 of 4 Old 6th May 2019, 12:58 PM
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I also use Costco exclusively in all my cars. F10 m5, e39 m5, Porsche 911 Turbo, Maserati Gran Turismo, Audi q7 v8, Shelby Mustang. All have never had an issue. In fact, it is Chevron 93. Same source.

Power, Styling and Sophistication. ///M5
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post #4 of 4 Old 8th May 2019, 11:20 PM
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