changing the oil in my sisters car today. due to family issues, my dad had to take the car away from her, so i figured id check the oil and everything else. pulled the dipstick, ridiculously dirty and way overfilled. i knew my sister never took care of it,(car has 70,000 miles but looks horrible and runs just OK, yeah its sad) so i stopped by walmart today and got 5 quarts of semi syn motorcraft 5W30 and an ACDelco Duraguard filter PF47.i also noticed they had a PF47E, im assuming this is the ecore filter that everyone says is no good. so is the PF47 filter a good one? thinking of using a PF52 next time, more capacity. also,ive heard motorcraft is a great oil should the motorcraft clean up any sludge left behind from the lack of oil changes?