Just got this warning this morning. 2010 35d with about 38,000 miles, original battery, nothing done to add oil in at least one month. Started driving sluggish this morning out of the garage, yesterday was fine, after about 20 minutes the engine icon appeared on the dash and the oil level too high error message showed up on the screen. Dealer took it in right away and gave me loaner. Waiting to hear if it is just a sensor.

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2013 X5 35d
2012 328i Wagon
2010 X5 35d (retired)
2008 535xi (retired)
2005 X5 4.8is (retired)
2003 e39 M5 (retired)
1999 e39 540i (retired)
1987 325i (retired)
1973 2002tii (retired)