The Ford Super-Duty 6.0L Powerstroke is, believe it or not, a great motor. But it came from the factory floor with a couple problems. Many of those problems get their start from the 6.0L's oil cooler. It's prone to clogging up and to leakage, as well. The folks at Bullet Proof Diesel have a one-time fix-it-and-forget-it part for that problem. The Bullet Proof Diesel Engine Oil System replaces the stock oil cooler with a large, air-cooled, real-world-tested external oil cooler.