There are many confusing info circulating the net about DEF fluids, brands to use, etc. Some Sprinter owners have been told by MB dealers to only use an MB
branded DEF fluid "AdBlue" on their Sprinters or the DEF system could
malfunction.
The truth is, if the DEF fluid is ISO-22241 certified then it is
ok to use as per Sprinter operating manual. I've been using "BlueDEF"
brand from my local auto parts store for many years without any problems.
When my Sprinter NOx sensor went south a few years ago, MB dealer even
tested the "BlueDEF" branded fluids in my tank and it passed to their
standards, no surprise there. I'm not claiming I'm a DEF expert, just a user
trying to save a buck from overpriced MB pee (ok, it's not actually a pee but
rather it's a combination of 67.5% deionized water and 32.5% urea.)
