Technology changes always bring with them a shift in maintenance practices. When it comes to maintaining equipment these days, people have heard there are new considerations, which are catching the attention of fleet mangers. One of the readers writes that since the 2004 EPA engine emission regulation, which introduced EGR technology the fleet has had to include several new checks during PM inspections. The fleet manager says his technicians are finding that the increased heat in the engine compartment is causing a lot of these front engine parts to fail more quickly than before. For many fleets, DPF and overall newer engine maintenance is still out for debate -- specifically when to do it.