no oil pressure

Purolators are usually about the same price point as fram; they typically have twice as much area, use a metal element end cap, and better anti flow back valves...and better multi pass efficiency. I need to find that link where a college fluid dynamics class did their research on that. They said Mobil 1 was top dog in their tests, and purolator, motorcraft, and wix were also in the top 5...fram was far and away the worst