Mercedes, and VW doing the same kind of test on Diesel m/vs'Another company running a foul of testing results Yikes!
Go to 2.53mins . the section on Mercedes is for one minute. From AutoGuide May 13th 2017.
https://www.youtube.com/watch?v=13z10Rwk7c0&feature=push-u&attr_tag=8k26iZfO3vdFLoc4-6
.GLTA