"So why does GM and Ford tell you to change the filters so often in there diesels?"

Don't know about GM or Ford but on my 12 valve Dodge/Cummins its not good for the IP to get starved of fuel, its really bad on the newer 24 valve Cummins.

I don't change my MB fuel filters till I notice a little loss of power on a hill.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"