How much did you put in? If you likely overfilled by just a little bit, then it may not be that big a deal. But if it's any significant overfill, then you definitely need to drain some out because overfills are not good. The best way to cure overfill on this car, from what I've heard on this forum, is to drain the front sump. There are two sumps on this car and therefore 2 drain plugs. Let the front one drain and that should be about a quart. If you need to top off slightly afterward then you can but I imagine that won't be necessary (level will probably be somewhere in the "OK" range after enough driving to get a proper reading).
Originally Posted by sensi09
You can pump it out from the top. Try a mityvac pump from sears or somewhere else local.
I remember seeing on this forum somewhere that sucking out from top is not possible on the M3. Don't recall exactly why...
2013 E92 M3 | Mineral White Metallic/Black/Carbon Leather | M-DCT | ZCP | Premium | EPS | Sirius | Michelin PSS 255/275 | 3M Tint 35% Sides & 20% Rear | IND Light Smoked Reflectors | LUX H8 5000K | OEM Black Chrome Grilles & Gills
Past BMWs: 2012 F10 535i, 2011 E90 335i, 2009 E90 M3, 2008 E70 X5, 2006 E90 330i, 2004 E46 330i