I have noticed very good gaines in running a little lower oil level. BUT NOT THE 4 QT CAPACITY. For instance my 1000hp Big Duke motor i have deep moroso pan. I think it's 10qt total with a 2qt filter. I lowered down to a total of 8qts and had a 15hp gain at the wheels.. I would say it all depends what type of pan you have. But no way woul i run that as you were saying.. After a run check the dip stick. If it has air bubbles oil level is a little high..