Breaking in my new SLK - Mercedes Benz SLK Forum

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#1 Old 05-25-2007
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Breaking in my new SLK

I just picked up my new SLK 350 and I was wondering what the best way is to break it in? I have about 70 miles on it right now. I heard to keep it below 4,000 rpm until i hit about 1,000 miles and to vary the speeds on the highway. I figured i'd ask on the forums since we are all driving the same car. Any advice?? thanks in advance!
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#2 Old 05-25-2007
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My car is still in the break-in period. It has about 850km, which means there are still 650km to go. At present, I stick to the "Comfort" mode and the car is always below 4000 rpm.
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#3 Old 05-25-2007
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Originally Posted by JOC View Post
I just picked up my new SLK 350 and I was wondering what the best way is to break it in? I have about 70 miles on it right now. I heard to keep it below 4,000 rpm until i hit about 1,000 miles and to vary the speeds on the highway. I figured i'd ask on the forums since we are all driving the same car. Any advice?? thanks in advance!
Everyone always disagree's with me on this, But I believe you have to really load an engine during run in as it's the only time certain things can happen. With my 55 I didn't rev it to the limits, put I really tried to run the engine though the rev range in 3rd and 4th and took it easy in 1st and 2nd.

I've had a few new vehicles and done this. I disagree and it's not a common agrrement that engines can be effected in a negative way by being really used very early in there life. I was on the track with 2,000 miles on the clock. I bought a bike once and had it on the track with 650miles on it just after a quick oil change. and that bike produced more hp than any other stock bike accoring to online dyno charts.

My 55 produced 303/317 hp/tq against 320/305 hp/tq of a 55 with similar miles
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#4 Old 05-25-2007
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Originally Posted by easty View Post
Everyone always disagree's with me on this,
I don't - I've always carefully run my new cars in as per the owners manual for at least the first 10 miles, then driven them. As long as you keep varying your speed, and not labor the engine in any gears you should be fine. When I picked mine up in Bremen, I has a word with one of the engineers about running it in - He was very indignant 'Zis is ze German car, it does not need ze running in'! He said no problem driving on the limmiter on the autobahns, just don't keep it there all day - vary the speed up and down by about 20mph.






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#5 Old 05-25-2007
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When I did the European Delivery this Spring in my 55, I got it up to 145+ when I put on about 800 miles. Up to that point, I was on the autobahn driving from Stuttgart to Amsterdam over a period of 3 days. I had a lot of varied driving in that trip in "C" mode. Then at the last moment of my trip, I gave it 80% and didn't go to the limiter at 155. I was satisfied.

I had been advised of the same break-in "rules" and chose to adhere to them up to a lower point. But my main concern of break-in was not for the key sake of the engine, it was for the rear differential and the tranny, then the engine. The tires also come into play, because they are pretty slippery when new and took about 1200 miles to really grip the road surface.

I also leased an E350 two years ago, and I still have it. I was hard on that car since day 1 and it has used the least amount of oil compared to all the other E350's out there (only 3 additional qts in 47,000 miles). So being "hard" on the engine during the break-in is good to seat the rings in the long-run. Just don't do doughnuts or burn-outs and you will be okay.

By the way, for the E350 oil consumption problem... dealers were instructed to run the cars at 6k rpm for 2 straight hours. And this was their official procedure for fairly new, youthful cars. After knowing that, the 3.5l engine will be around for a VERY long time.
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#6 Old 05-25-2007
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I know MB randomly select cars and put it through their test track in Sindelfingen factory and they don't just cruise around the track. From what the MB tour guide said, they drive them fairly hard around the course. But my delivery lady said to drive it anyway I want if I'm not planning to keep it long term, if I am then keep it under 4K rpm for the first 1,000 miles.

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#7 Old 05-25-2007
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Never been concerned about an engine before all AMG's are bench tested to the limiters and randomly picked MB units are done also what concerns me more is the tranny but still thats no reason to not have fun just don't thrash it accelerate briskly but not at full throttle and vary the speeds and RPM's.

Its just about common sense you know, one thing to think about however is the ECU does keep a log that could come back to bite you in the ass.
#8 Old 05-25-2007
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Originally Posted by DansSlk View Post
Never been concerned about an engine before all AMG's are bench tested to the limiters and randomly picked MB units are done also what concerns me more is the tranny but still thats no reason to not have fun just don't thrash it accelerate briskly but not at full throttle and vary the speeds and RPM's.

Its just about common sense you know, one thing to think about however is the ECU does keep a log that could come back to bite you in the ass.
Oh yes... the inevitable flight data recorder. Just keep some good magnets handy and you'll be alright if that day ever comes.
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#9 Old 05-25-2007
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Oh yes... the inevitable flight data recorder. Just keep some good magnets handy and you'll be alright if that day ever comes.
Oh yeah of course the Tele-Aid in the US also i totally forgot i meant the actual engine ECU itself also holds a log of peak values and basic info.

Might not be so wise to get the magnet on it however but i think its a great idea for the Tele-Aid
#10 Old 05-25-2007
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Is that ECU installed in the car shipped overseas?
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#11 Old 05-25-2007
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Originally Posted by watsons View Post
Is that ECU installed in the car shipped overseas?
Sorry?

The Tele-Aid control unit is for the US market only but the control unit for engine management is on every car made.
#12 Old 06-07-2007
 
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When I was a road trolman, we would take our new cars day one to tha drivin track an run them wide open and do all the drivin tricks we were gonna do in our job. Then we went back to the garage and inspected the thing front to back, top to bottom, then off to work. Never had a problem with any of the new cars and most had 60-70k when turned in. Them was all hard miles too. I still have my 77 Gran Fury silver /burgundy 440 mag with 90k+ and it is like new, runs 140 mph at tha drop of a hat, no smoke cept tha tyres. I drive my personal cars the same from day one, I drive like the car will be driven everyday. Never a problem. If the manufacturer expects a breakin they should set the limiter to that til period is over, they don't and I ain't. If I buy a new tractor,I put it in the field and work it hard, if it breaks, they bring me another one til they fix it. Corse I am payin more for tractors than my new cars so I spect good service from the dealer.
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#13 Old 06-08-2007
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Doesnt matter if it is in S,C or M-mode most importantly just let the rev's under 4,500rpm.

06 SLK55 AMG (Kleemann K2)
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