I lug my L4060 plenty, in fact, it's at idle 75% of the time easily of actual running hours. no problems, just run the regen and let the regen cycle complete before turning it off, preferably a little longer than just finishing. think of it like a turbo, or anything mechanical really, you don't want to run it hard until it's warmed up.....but by the same token, you don't want to shut it off immediately after a heavy amount of work, let the oil cool down and the engine itself cool down, now with the added DPF, you'll want to let that exhaust cool down a good bit before killing it. otherwise I have no problems to speak of. most truck issues are user related, didn't put fluid in it, trying to run oil through it like old ones ran etc. I've had a number of DPF and now DEF trucks, never a single emissions problem from any of them. my tractor thus far has been bullet proof. now...keep in mind problems do come up, but it's a result of the added components, not necessarily that they are emissions devices, all devices fail. adding more devices only increases the possible frequency of the problem. With that being said, I understand Kubota had a serious problem with their B3350 line....I do not know if that issue has been resolved, but at one time dealers stopped selling them. again, read the instructions and run it when it's full or just before and you'll be fine. I try to do mine while doing something I will be at full RPM for a while for....like brush hogging/mowing. I'll be out there for a while, so if it says it's at 90%, go ahead and do a regen. otherwise I've had not a single issue. Neighbor uses an M7060 for hay, he has close to 1000 hours on it, no problems thus far.