Changed the frame and engine mount diesel fuel filters in a Freightliner Cummins ISB 6.7L. Neat thing about the Davco 243 is the ability to monitor filter restriction based on the height of the fuel shown on the clear cover. Once the fuel level reaches the black mark it means the media is fully loaded and is about to go into bypass. Fuel was going way past the black mark and who knows when it was last changed so used my lunch break to change the filters.