Guys delete these and 75% of them have more issues and way more expensive ones then they did before. You should hear the sob stories….Then come here looking for help because no one will touch their truck. I’m not gonna get into about how these engines are actually good, been there plenty of times. It’s just the guys that don’t understand them hate them. These trucks all have their issues doesn’t matter what make you buy. To be honest Mack/Volvo seem to have the least amount of issues. These trucks are what they are, would I prefer no emissions??Yes…However not the world we live in so we need to move on from that. If your completing parked regens then your after treatment system is more then likely ok. My suggestion to you is start loading it heavy and running the balls off of it and getting the temps up. If not start looking for exhaust leaks I guess. Or sell the truck and buy an RD etech or CV ASET. You will still find disappointments with those as well.