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      06-20-2021, 06:39 PM   #5
skyactiv0
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Drives: 435i XDrive
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Quote:
Originally Posted by ODX7 View Post
I wouldn't recommend using Costco 91. I use to run Shell 91 and when I went Stage 1 91 Octane I started experiencing some knock which stopped when I switched over to Petro 94
Thank you for the advice, I wanted some real world experiences on this topic.
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