About a month ago one of the sprinters in my fleet blew the motor. It is an 06 Dodge 2500 158" with 300k miles. One week (1000 miles) prior to the failure it started throwing "cylinder 1 misfire" code and the engine would shut down. Needless to say it layed down and wouldnt start back. Had it tore down at the garage and they found piston #1 burnt up. The mechanic said the oiler for the #1 piston was completely clogged up. The engine is at the machine shop now being machined. Im just wandering, with many of my fleet creeping up to 300K miles, should I use some type of oil treatment to keep the others from getting clogged. Any input is appreciated.