Last week my 2014 promaster diesel hit 200k miles. I had lots of problem with it from 58k miles til 126k miles when fca finally replaced the transmission with a brand new one under warranty. I had axle and ball joint issues soon after that. It was about a $4k repair. i had many miles of trouble free driving after that. When the weather turned cold, the van jumped out of gear, again. I went several thousand miles with out an incident, then it got cold again, dang. it jumped out of gear again. I decided no more. I traded for a 2018 3500 extended with a gas motor. If a diesel had been available i would have gone that route. I loved the great mpg of the diesel. I do like the extra room of the extended. I have seen many other with over 300k miles on these gas vans. Any one offer any dos or donts. This is my 1st gas vehicle in many many years