My 2014 Mercedes glk 250 with 16,705 miles, on 11/03/2015 experienced the engine warning display stating to add blue. I did this but the warning did not remove but stated I had 10 starts remaining. I was 700 miles from home so returned conserving my remaining starts. Found multiple problems with the blue tech emissions system including def injector nozzle failing to spray. All covered by warranty. On 06/15/2019 with 58,129 miles, the engine warning light again came on to add blue. I checked bluetec level to be nearly full. The warning stated I had eight remaining starts. Being 700 miles from home, I returned. Having three remaining starts.I took the vehicle in for immediate repair. Found nox sensor 2 faulty and was replaced. On 6/28/2019 with 58,126 miles, the add blue warning again appeared. The bluedef warning only 10 starts remains. The nearest merecedes dealer was in denver being 173 miles away. I took it there where they replaced def module, the preheater and tank temp amoung other faults. On 7/15/2019, with approx. 58,300 miles, the same warning appeared. Returned to the same denver dealer who then replaced the nox sensors in the emission system. I was informed that the frequency of repair for this model is very high and expensive (my last totaled $5,000). This vehicle is totally unreliable and should have been recalled. Because of the emmision system utilized, numberous other problems occur such as the complete windshield washer system was replaceddue to the extreme heat created by the system. Same with oil leaks, etc.. Mercedes could have at a minimum extended their skimpy warranty of 50,000 miles but they refuse to acknowledge any fault claiming "the best or nothing"! this model is definitely nothing!

- Glenwood Springs, CO, USA

Blue tec system for diesel fuel emissions in my 2014 Mercedes Benz Glk250 model is inherently flawed with repeated failures that cause the car to "go limp" (unable to start after 10 or less starts when there is a failure in the blue tec system.) as a result, the car is not only unreliable, it is unsafe should the car "go limp" when needed for emergency or on a road trip or unable to drive out of an unsafe area, etc., since only a Mercedes Benz dealer can re-set the system after repairs so that the car will start again. To date (5/16/19) my 2014 Glk250 has 28,388 miles and has been returned to the dealer 6 times (first time, Dec. 6, 2014 and 5 more times since) due to the electronic warning message "10 remaining starts/add blue" which has always turned out to be an electronic failure in the blue tec system. The message may appear when the car is parked and the ignition is turned on or while driving. Sometimes, the check engine light may first appear followed by the "remaining starts" message a few days later. There is no logic or set sequence. And when it appears, there is no alternative but to immediately go to the dealer for repairs and to re-set the computer so the count down stops and the car can be started. The reason this is not a widely known problem is that there were not many glk 250 blue tec cars sold in the U.S. and Mercedes Benz no longer builds this model and has stopped offering diesel passenger cars in the U.S. for more information on complaints, see link.: https://mbworld.org/forums/glk-class-X204/517220-2014-Glk250-continued-issues-beware.html note: The date below is the start date of the blue tec problem for my car and the milage below was for the first time the car was taken to the dealer to fix the problem followed by 5 more times afterwards since 12/6/14

- Coral Gables, FL, USA

"spontaneous sunroof explosion" - my 2013 Mercedes Glk250 bluetec experienced a spontaneous sunroof explosion while driving on the highway at highway speeds. An accident nearly occurred as a result of the gunshot like impact experienced inside the cabin of the vehicle as a result of the sunroof explosion. I had several chards of glass embed in my skin and in my eye, as the explosion produced an ultra fine dust of safety glass particles that were unavoidable. No impact debris or foreign object was attributable to the cause of the explosion, hinting at manufacturer defect.

- Tulsa, OK, USA