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At the shop I was at, we had a rash of BMW customers coming in with failed fuel pumps (one customer had multiple failures), took a month or so to make the correlation but turns out they all exclusively filled up at Costco. Avoid Costco gas, there is a reason it's the cheapest around.
But, I do have to say, to Costco's credit... they paid all the bills once we had brought it to their attention along with a fuel sample analysis.
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