Along with oil, antifreeze, transmission fluid, brake fluid, and fuel, modern diesel engines also need DEF to run properly. All North American Sprinters built after 2010 have DEF tanks.
DEF helps with emissions control and the computer in your van will stop you from driving if it detects an empty DEF tank. But don’t panic if the DEF light on your dash comes on. You’ve got plenty of time to fill up.
So, what is DEF, why does your engine need it, and what’s the best way to fill the DEF tank?
Continue reading “DEF (Diesel Exhaust Fluid) – the other engine fluid”