I've added one oral to each of my cycles so far. I'm not sure this is perfectly scientifically sound, but if I'm using longer ester (enanth) test as a base, I like to use the orals more in time with my harder workouts. That is, the oils are always there in the background, but I like to take the orals (winny this time, anavar last time) within a few hours of my workouts so that their peak effects are in sync with my workouts and immediate recovery. Their levels then drop until the next day or so on another hard workout. Thus, I figure I'm getting the most benefit at key times, but not exposed to as much drug necessarily as just increasing the test enath which is always around.