This varies. For the engine oil on the RAM Promaster (gasoline), the “Automatic Oil Change Indicator System” will provide an alert as early as 3500 miles, under severe usage.

In the User Guide that comes with your Promaster, it is suggested that the engine oil and filter be changed, at minimum, every 12 months or 10,000 miles. You should get an alert before that, in most cases.

The Indicator System should be reset by the service tech each time an oil change and filter service is performed.