I have a Mercedes Benz sprinter V6 turbo diesel check engine light came on indicating DEF problem . My wife was in hospital here after being flown in from Tummancari NM I explained the situation this was day before thanksgiving. The MB sprinter was in count down mode ready to go into limp mode and only 20 mph . Desperate situation !They jumped right On it and did the long countdown and and cleared it I had pumped out the bad DEF added new stuff they topped it up. And took a long test ride and cleared it . Very professional and very reasonable price a lot cheaper than Mercedes . All people within 500 miles use aardvark I can sea why couldn’t be better and fastest service. Scott Beck