you have to put the nozzle in just the right amount, it can be touchy....any back pressure and it thinks the filler is full. Work around. Fill a five gallon gas can and then pour into the M5.
Mike
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2018 M5 and 2019 Porsche Boxster GTS
Prior. '94 325is, '97 M3 Lux, '16 M2
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