Commination of HV pump drawing extra oil from the pan to the upper part of the motor and what oil is left in the pan sloshing away from the pick-up, while you are doing a wheelie in your grandma's station wagon. LOL You could be correct on your comment. I am referring to ancient recommendations. I do have a deep sump in my 340 Van but I also have one in my stock 69' 340 Dart, as in my photo. Never had an issue with either one. Have not yet done a wheel stand in the Dart.