BigHorn3500
Active Member
I'm curious is there a difference in def fluids. I know the shelf life is two years, There are so many different brands,The guy I purchased my truck from always usded Peak Blue DEF, wich averages around twenty five dollars for 2.5 Gal. Yesterday at Running's they had a brand called blue def for 8 dollars for 2.5 gal. I don't mind spending more for the Peak brand but if there's no difference I wouldn't.





