How long is breakin period in brand new car? - Mercedes-Benz Forum

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post #1 of 6 (permalink) Old 11-01-2012, 07:23 PM Thread Starter
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How long is breakin period in brand new car?

It has 200 miles on it so far, I've tried to drive like grandma but had a few fast merges on the freeway. I also got it up to 90 a few times. The salesmen said 500 miles is the breakin, the service guy said not to worry about it at all. At what point can I drive it like I stole it? During the breakin period, what should I avoid doing?
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post #2 of 6 (permalink) Old 11-01-2012, 08:32 PM
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Have you seen the factory kid driving your car with 0.1x miles on factory parking lot?
For about 20 years now the engines are manufactured with so close tolerances, that break in period is obsolete.
I still would not redline it for first 1000 miles, but than if the situation would require it, I would not hesitate too much.
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post #3 of 6 (permalink) Old 11-01-2012, 08:35 PM
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I know many that say drive it like you are going to drive it-like you stole it. Not as important now as in the past. I personally would break it in per the dealer, it's only 500 miles and everything has to get to know the other parts and clearance. Treat it with respect, do your little bursts to motivate you to enjoy it, just don't overdue it.
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post #4 of 6 (permalink) Old 11-01-2012, 10:25 PM
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I was told 500 miles when we got two different MLs new.

Then 500 miles when a new trans was put in the 99 ML430. There was a nifty tag from MB hanging from the rear view mirror when I picked it up after the new trans. So I am going to stick with 500 miles until the vehicle can be hammered to the floor testing out 0-100 times.

I agree the engines are good to go. I think the transmissions need some time to work in.
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post #5 of 6 (permalink) Old 11-02-2012, 07:09 AM
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I would keep it to no more than 60% of red line, or about 4000 RPM, for the first 1000 miles.

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post #6 of 6 (permalink) Old 11-02-2012, 07:21 PM
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About 1,000 miles I usually do of soft driving. No redlining and flooring it out! In the good old days, break in oil was a non dertegent oil. You did not want anything to stand in the way of some friction so the rings could seat. Not necessary in todays engines most say but still just give it about 1,000 miles or so. Makes me feel better A c250 however you may be seeing higher RPM's due to its little engine. I know on cars like a C220 or C240 they are ALWAYS shifting at 3,000+ RPM.
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