..we are remodeling our baths and the tile setter has a 2008 ctd that he's having problems with. Maintenance has not been .He has not been really been towing heavy for about a year so the diesel particulate filter has completely filled up. He has pulled a boat up to the ski area which is about 8000 ft but it didn't help. Can he pull a heavy load up to silverton, co witch is about 10000 ft aor is it too late. Plus is the turbo in danger in running it too long like this . thanks for your help, Brett