Brad Penn
Hammertime,
The price for a case (12 qts) of Brad Penn 20W50 racing oil in our area is a few dollars either side of $55.00. The price of the cheapest brands of racing oil is somewhere around $40.00, making Brad Penn an even bigger bargain.
ZDDPlus is an oil additive than contains zinc as one of its important ingredients I just sent a friend who also had trouble finding ZDDPlus (12) 4 oz. bottles. Including the shipping, the cost was $135.00. They recommend (1) 4 oz bottle to a 6-7 qt oil change. We use this in addition to the Brad Penn oil.