When the drain valve sticks open, very little oil is forced through the filter, and the engine oil pressure drops dramatically. Get your 6.5L Power Stroke back to blueprint with BulletProof Diesel.

This is why you change your Ford 4.0L OHV V-6 oil regularly. Once we removed the lower intake manifold on our extra engine, we were met by a thick layer of sludge. Luckily, most of the sludge came ...