OP
Sorry to hear. My suggestion would be to get a written report from the BMW dealer on the root cause as per their claim of bad gas the repair estimate the receipt from your last fillup and send a package of all three items with a written letter to the gas station owner (with a copy to the dealership svc mgr).
In these circumstances I would avoid calling and asking if they had other complaints. Just keep track of all the details and communications.
The gas station should have insurance to support your claim.
Goodluck.
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