That one, I would actually leave alone.... What else are they hiding about the vehicle? Ordinarily you could say it was a typo, but with the two prior readings being above 7500 and one of the readings was during servicing where the info is read electronically off the key, I would say it was more than likely an acurate reading... Run away from this X...

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Robert

1994 740iL
2001 X5 4.4i Sport
2004 Kawasaki ZX-6R
2009 VW Jetta S