Blockcaver
WKR
My Ford dealer in BC just replaced my 2015 F350 DEF heater free of charge. I had >180,000 km on the truck. Worth asking your dealer.....but this is Canada so maybe different in Texas.im at 210k in 2015 6.7. Small water pump leak at 180k(that i could of let go for a long time) and DEF heater has been out since 110k(refuse to fix it and apparently doesnt need to be)
Im keep thinking in going to get a clogged DPF soon but so far so good.