This is from the same Duramax as the 400,000 miles of samples. Filter is a Fleetguard FS20002. The inner screen covering the final fuel filter was purposely cut and lifted out of the way.The filter was in service for 40,000 miles during the summer, hence all the black staining from the asphaltenes being cooked out of the fuel. Fuel restriction was only 2" higher than a new filter (ya, I check that too).