Heard a shop foreman in Phoenix talk about DEF filter changes
Honestly, he said a lot of guys are just going by the dash light for the diesel exhaust fluid filter, but the manual for a 2020 Duramax says to check it every oil change. He saw a truck come in with the filter totally clogged at 15,000 miles because the light never came on. Tbh, that's a quick way to get a big repair bill for the dosing system. Has anyone else started checking the DEF filter way before the light tells you to?