Mercedes Benz Blue Tech ??

I’m looking at buying a 2014 Mercedes E class diesel. couple of questions before I buy…
exactly what is the blue tech system? and what happens if I never refill the system. just for FYI the last Mercedes diesel i had was a w123 1978 300d and that thing was like a Timex watch… all i needed to do is change the oil and that was about it. I hit a antelope on CO86 just outside of Kiowa and still limped home to Parker. so in short how "sensitive " are the newer diesel Mercedes ? and what do i need to look for if i am getting a used one? also any input on the BMW Diesels, I’ve heard mixed things about them.thanks
yes i know i am asking two different questions at the same time… so I am looking for input on both the Mercedes Benz Diesel and the BMW Diesel cars.

Blue-tech a a Urea injection system to reduce NOx emissions.
If you don’t refill it, the car won’t start after awhile.
Besides which, you would be a polluting d-bag.

how bad of a dbag? old school diesel prechamber dbag? or VW emissions system cheat dbag?
Urea? so can i pee into the refill?

Not quite the level of dbaggetry as the coal roller dbags certainly…

OK what I’m really after is the " avoid this car like the plague because…(insert horror story here) or yes this is the best thing UNTERTÜRKHEIM or MUNICH has made in the last 20 years…Just be aware that … will break at 80K miles .

my neighbor (2 miles down the road) has a dodge ram that smokes like an Тепловоз 2ТЭ116…

yes it “coal rolls” in a way that “Soviet Russia” could love.

No you can’t

For your second question - I’ve got a 7 year old BMW 120d and have no problems at all. OK, it only has 35000 miles on it, but I have friends with far higher mileage BMW diesels that haven’t had any problems either. On a steady motorway run I can cruise at 75-80 mph and get 50mpg.

Anecdotal evidence (in the UK) suggests that current German luxury cars are not as well made today as they were 8 or 10 years ago.

Never own a German car without a warranty.

Not always… my '96 S420 has required no more than oil change / wipers / one tail-light bulb in 2 years of ownership.

Does have an obvious flaw - much more attuned to 85-95 on the freeway than trundling along at 70. Definitely made for the Autobahn. :smiley: