Brad Penn (American Refining Group)
Penn Grade 1 oils contain a significantly high concentration of zinc and phosphorus additives. This will come as great news for all you with flat tappet and roller cams. Because the oil can benefit more than just race cars, the name has been changed. It's great for classics, historic, vintage, and muscle cars. If you're in need of a high-quality oil with the benefits of zinc and phosphorus, take a look at the Penn Grade 1 line.