You realize 4.4 engine's take 8 quarts of oil, not 5. What about the air filter? And have you checked your belts. For your fuel filter, the hose clamps you might have to cut off and are not reuseable, so buying some screw clamps would hurt. Are your power steering lines leaking? How about coolant hoses, are they getting old? Have you checked your rear ball joints recently? what about the front suspension, any play in the center link or control arm bushings?