This is a silly thought, but did you just change the oil and maybe lost count while filling it up. A little too much oil may let the crank froth it up pretty good-Aluminum Squirt
Good point.
Also if you did do an oil change and you have a 10quart pan does'nt mean that you "should" put 10 quarts in it. Sometimes the oil will go above your windage tray (if you have one) becuase of the angle of the engine.Need to check that on all enginges really,because if the cranks splashing , your leaving some rpm and power on the table. Just my .02 on this.