I drive a bus for our local school system,All of our newer buses run higher temp (205-210 range)than we thought was normal. after speaking with the International techs we were told not to worry about temps until they got above 220.
In years past I owned a couple of mack tandems coal trucks and if they got around 200 we stopped or downshifted so temp would drop.
The newer engines are designed to run hotter and as was mentioned it is due to getting a cleaner burn and cleaner emissions
FWIW I personally would contact Cummins and speak to a Tech and get a real expert opinion .that if you have a problem you can catch it before you destroy a good engine,or if its normal you can have peace of mind when operating it.
