Sounds like a defective filter housing. I have seen trucks come through my shop that have had this issue. Pm me if you need anything. Or call my shop RIVCO Motorsports 951-817-7685. All I work on is duramaxs..
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The 2015s were recalled for major electronics failure for all super dutys..diesel or not...wonder if this has something to do with it..
The PPE dry sump was I think intentioned for 1000hp+ trucks that mainly drag race or sled pull. I was told it wouldn't be beneficial for stock trucks...even...