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Me and my cousin both had misfiring 335s (common issue) that took quite a few dealer visits to fix (for me). They fixed mine over a year ago, but he still has problems to this day. He ONLY buys Costco gas, but I've never used it. And his misfires were always more severe than mine. He hates his car now because he gets a check engine light every time he accelerates hard, yet the dealer can't seem to fix it. I need to show him this, since I don't think he ever considered the fuel.
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2012 F10 535i
2013 E70 X5M
2007 E92 335i - sold
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