really good article from MIT. Shows the amount of aeration, which is apparently linear, and affects of engine speed, oil pressure, return lines, and windage trays.

http://dspace.mit.edu/bitstream/hand.../166145859.pdf

Pages 14-17 show the math and how temp,pressure,engine speed bump the %aeration.

So, keep your eyes on that "HI" oil indicator display that appears if you overfill the crankcase.... Over time, it could cause more problems than you think

SAE has a "paid" article too.... Wasn't worth it. If someone with a built engine and hi RPM redline and a windage tray wants to double check aeration factors, and measurement, might be worth it.

Have to pay for it though.

Method for Prediction of Engine Oil Aeration Rate