We bought the bus with 410000 miles on it. No smoke or leaks from the engine or tranny .
In the beginning we had a hard start issue that I traced to fuel pump that lost its prime. A new fuel pump was $300.. No on eBay for $150. I choose to use an electric fuel pump instead. After that no problems with the engine anymore.
Ours does not have the egr system as being a 2004 with a 2003 engine.
On our last 9300 mile trip we averages 9 mpg with towing a jeep Cherokee. Would have liked that to be higher. Think that is caused by the hydraulic cooling in that is in the re city bus.
Replaced oil and filters ...all low prices if you look around a little. We replaced the starter motor because of slipping over ride clutch. $220 I believe.
I like the engine.. It is quiet.. Pretty modern.. Has individual injectors / pumps that are easy to replace.
Used prices are good..
I would buy it again if I needed a bus or truck.