Allison m20 behind 8v92ti. Stbd oil level low mark when cold. Oil honey color. Idled the engine 1/2 hour periodically running to 1000 rpm. Oil level rose to 1/2 between full and low but foamy oil dip stick. Added 1 qt 40w, oil level at full foamy.I have read that if overfilled will cause foaming, but under filled? Temps: at brass fitting to trans oil filter 125 by infrared. Lower er gauge - 137. Lower helm - 150