2014 BMW 328d xDrive Sports WagonEnlarge Photo
The Mercedes-Benz GLK250 Bluetec, which was introduced earlier this year with the same engine as the E250, doesn’t have the feature yet; but officials confirmed that it soon will.
Stop-start for diesels...Really?
While stopping and starting diesel engines repeatedly might seem counterintuitive to longtime diesel fans at first thought, it makes sense now. It didn’t always, acknowledged Bert Herring, general manager of product planning for Mercedes-Benz USA; but Herring points to major advances in electronic controls that help make sure that start-stop only operates when the engine is fully hot, and that it keeps the engine within an even narrower temperature window than with gasoline engines—hot enough for emissions catalysts to operate within their peak range.
What that means is that if you get a diesel vehicle with start-stop, you might not notice the feature working at all in cold winter weather; while out in a Southern California traffic jam, it might save you quite a bit of fuel.
Surprisingly smooth for new Mercedes-Benz diesel four
2014 Mercedes-Benz E250 BlueTec - First Drive, August 2013Enlarge Photo
True enough, in our recent drive of the E250, we noticed a surprisingly isolated vibration as the purring of the diesel four stopped and started at a stoplight.