My dads got a 2010 lmm with about 10,120 miles bone stock minus the banks air intake got it before the urea also And it hasn't done a single regen. I've put most of the miles on it anyways. Tail pipe is clean enough to eat off of.. I'm not familiar with the cycle but shouldn't it have done the cycle by now? Dad and myself are kinda getting worried that its not working and it's clogging up and could cause future problems. I'm trying to get him to do a DPF delete and he's considering it. Could anyone enlighten me?