TS21ssoExplorerJul 12, 2018OLD DEF??Recently, going from a 5th wheel to a used DP I have a question about the age and effectiveness of DEF that is in the tank of a little used motorhome over the past year. As a driver of a Diesel picku...Show More
NRALIFRExplorerJul 12, 2018Buy a DEF refractometer on Amazon for less than $20 and you will know if it’s good or not. :):)
