excess viscosity increases demand on the suction side of the lube system. bb mopars are borderline in this regard already, and if the pressure side demand is increased (bigger clearance, high rpm), the suction side demand will increase also. your viscosity is probably WAY too high with all that stp, and fairly thick oil to begin with. do you have a 1/2" or external pickup? and to the guy with the hemi with the rod bearing squirting out, DUDE, you have two different kinds of rod nuts. or am i hallucinating?