And now comes Mercedes : Forbes article here. Forty times the allowable NOx emissions in cold weather? Well I suppose technically that's not cheating at the test labs (as VW presumably did) if no test labs are freezing cold inside... But perhaps the question is not really whether you're cheating at the test labs, but rather cheating on the world. "We need to protect our engines in cold weather". Great. Protecting schoolchildren from 40 times too much NOx when we drop our kids off at school in cold weather, anyone?