The manufacturer of the ProMaster van chassis says this in the owner’s manual:

We recommend you use API Certified SAE 5W-20 Engine Oil, meeting the requirements of FCA US Material Standard MS-6395 such as MOPAR®, Pennzoil®, and Shell Helix®. Refer to your engine oil filler cap for correct SAE grade.

The ProMaster is equipped with an oil change indicator system. It will light to announce when it’s time for the oil to be changed.