Engine Break-In Procedure - 2014 Mercedes-Benz CLA250 Long-Term Road Test

2014 Mercedes-Benz CLA250 Long-Term Road Test

2014 Mercedes-Benz CLA250: Engine Break-In Procedure

December 03, 2013

2014 Mercedes-Benz CLA250

According to the owner's manual, this is the recommended engine break-in procedure for our 2014 Mercedes-Benz CLA250. The condensed version:

  • Vary engine speeds for the first 1,000 miles.
  • Avoid driving at full throttle during this period.
  • Change gears before throttle is two-thirds of the way to redline.
  • Do not manually downshift to engine brake.
  • If possible, do not depress the gas pedal enough to cause a downshift.
  • Ideally, drive in "E" mode for the first 1,000 miles.
  • Do not drive faster than 85 mph.
  • Only allow the engine to reach 4,500 rpm briefly

Mike Schmidt, Vehicle Testing Manager @ 739 miles


  • vvk vvk Posts:

    WOW, this is by far the most stringent break in procedure I have ever seen! No downshifting for engine breaking? I don't think I have ever heard of this before.

  • At least they allow for a normal max speed. I typically keep my break-ins at 55 or below (I always stay in the right lane on highways to avoid getting flipped off)

  • noburgers noburgers Posts:

    I wonder if e-mode prevents any of those events from occurring? The hardest to hold to must be the one about not manually down shifting--thaqt's just habit.

  • bassrockerx bassrockerx Posts:

    i have my doubts most customers still do this

  • mfennell mfennell Posts:

    I was under the impression (from a long ago Kevin Cameron article in now-defunct Cycle magazine) that some engine braking was useful for break-in.

  • agentorange agentorange Posts:

    If the engine breaks when you downshift you are doing it wrong. Please advise your spell checker (or is it chequer?) about breaking and braking. I thought this car had an automatic? What is this manual downshifting all about? If you are driving a car in break-in mode, you won't be going fast enough to need engine braking in addition to the brakes.

  • eriches eriches Posts:

    Interestingly, driving in E mode is pretty much a must during highway travel anyway. In Sport (S) mode, you can't access 7th gear -- 6th is as high as it will go. Of course, there is a third option: manual mode. --Erin

  • fordson1 fordson1 Posts:

    If this thing has rev-matching on upshifting and downshifting, the technically it's not engine-braking even if you downshift manually.

  • agentorange agentorange Posts:

    @fordson1 Even with a matched shift you may be are slowing the car against the compression at significant revs = engine braking.

  • iode iode Posts:

    Broken the 1k break in period not long ago. It's time to explore my options for fun with Sport and Manual. :)

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