We have a 2015 Ram promaster 3500 with the 3 liter Ducato diesel. In Canada its a bit of a rare bird so I thought a Fiat Forum might have a bit more info. The van is great but the instrumentation is a bit poor. When I need DEF fluid the light goes on. Not always convenient. Same with oil change. My Honda will give me the percentage of life left in my oil. Is there an OBD reader which can access DEF levels and maintenance status? I may resort to a dipstick for the DEF! Open to any suggestions, thanks.