Had a new fuel filters put in last time I had some work done because they looked "muddy". Had the work done, drove it half a mile as a test run, checked the BRAND NEW filters again, already "muddy" looking after half a mile of driving. Dropped the tank, drained all fuel, did ANOTHER fuel filter swap, and after 2 tanks of fuel, WITH FUEL ADDITIVE, they're "muddy" yet again. Am I getting bad fuel??