Any need to "break-in" the engine? - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 03-11-2006, 11:21 PM Thread Starter
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Any need to "break-in" the engine?

I just leased a CLK 350, 2006. I have about 30 miles on it from driving around town and already have to go on a trip. It's not a long one, just about 50 miles, all highway at about 65 miles per hour (110km/h).

I'm just wondering if it's still necessary to break-in an engine where you have to avoid driving it at certain speeds for certani lengths of time. I remember this was the case for cars back in the early 90's and before, however is this still something I should think of?


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post #2 of 4 (permalink) Old 03-12-2006, 03:32 AM
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RE: Any need to "break-in" the engine?

I wouldn't mind it that much with these modern engines. They are put together better and more precisely than 20 years ago.
And 50miles isn't that bad. It would be a different story if you would do a 1000 mile highway trip when the engine is new...

Oh yeah, don't forget to do a few semi-hard accelerations if you see the chance. This will keep the engine alive and not turn it into a lazy thing.

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post #3 of 4 (permalink) Old 03-12-2006, 07:36 AM
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RE: Any need to "break-in" the engine?

If anything special is required, it will be spelled out in the owner's manual.

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post #4 of 4 (permalink) Old 03-12-2006, 08:07 AM
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RE: Any need to "break-in" the engine?

Not sure if it's the same for non-AMG cars, but AMG, in their owners manual, says to do the usual break-in for 1000 miles. (Keep it below 4000 RPM, no more than 2/3 throttle and vary your speed.) They say that the engine is already broken in at the factory, but the tranny and differential are what must be broken in.

It's interesting that all the controversy I've seen about how to best break in a new motor doesn't even mention the tranny and rear end. Hmm.
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