Stopped at a Cummins engine shop yesterday and asked about additives. They said none are needed on '04, '05 & '06. Also, 5% maximum on biodiesel. I didn't ask about prior years.
Did pick up a Cummins "Powermasters Road Club" mag. Sometime in '07 they're raising the displacement on the 5.9L to 6.7. It will have three power/torque settings: ISL= 365/1250, ISC= 330/1000, and ISB=325/750. Also going to 18 qt. oil pan and 20,000 mi. oil change. I would have like to have an engine like that back in the 50's when I started driveing truck.
