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    A look at how AMG evaluates M157 Twin Turbo motors on their test bench - Is break in even necessary?

    Many Mercedes and AMG owners in general forget that the motors in their vehicles have been tested to strict standards before the motor is ever put in their car. Kind of makes old thinking regarding break in go out the window. Every single motor is run to redline and tested to make sure it was assembled correctly and that the motor is doing exactly what it should be. Just look at the glowing manifolds and exhaust form the high temps due to the motor being run hard for an extended period.

    Click here to enlarge

    Old thinking regarding break in is that you need to baby the motor to seat everything properly. The reason break in is recommended as well as an oil change early on is due to small metal fragments from the fresh parts that can be caught in the oil/motor. The break in is not so much to seat the parts which AMG already does before you get the motor but to protect from an early failure due to running the motor hard in case metal shavings were to get into the motor.

    As a matter of fact, a hard break in will usually result in a stronger motor with properly seated parts. Mercedes tests these motors hard as seen here. Don't fear running your own motor hard, it will love you for it. Plus, Mercedes already did.


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    Breaking in motors is a non issue with todays manufacturing and production techniques. I always cant stand hearing people say (redneck voice) "well I break mah motor in with 400 easy miles, then change the oil to skunk urine, then go 500 miles and stay under 2000 rpm, then change oil to blue whale oil and then I wait another 400 miles and it's gud!!!!"

    Yea no, OEMs know that people wont break in their cars, so a lot of times they either do it for them or they design the car to basically be broken in the first time the car turns on. And like you said, AMG, BMW, Toyota, Honda etc... big companies wont sell their car and gaurantee 100,000 miles of service if they had to OMFG BBQ break in sequence or else it's a toasted motor.
    Some people live long, meaningful lives.

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Breaking in motors is a non issue with todays manufacturing and production techniques. I always cant stand hearing people say (redneck voice) "well I break mah motor in with 400 easy miles, then change the oil to skunk urine, then go 500 miles and stay under 2000 rpm, then change oil to blue whale oil and then I wait another 400 miles and it's gud!!!!"

    Yea no, OEMs know that people wont break in their cars, so a lot of times they either do it for them or they design the car to basically be broken in the first time the car turns on. And like you said, AMG, BMW, Toyota, Honda etc... big companies wont sell their car and gaurantee 100,000 miles of service if they had to OMFG BBQ break in sequence or else it's a toasted motor.
    Exactly. I'd be even less concerned with something from AMG or M as they test the absolute living ____ out of these motors. Seems they were varying the RPM hard there on the bench too.

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    all my cars get paddle to the metal from the dealer and make sure i hit the top speed limiter.

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    Did anybody notice how the MCT is holding up and shifting?. Just imressive

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    I also saw BMW dyno each SUV before it leaves the assembly line in Spartanburg...so more data supporting the theory that break-in is largely irrelevant in terms of power output.

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    So any thoughts on why some auto manufacturers like MB recommend a certain break-in technique?

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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    So any thoughts on why some auto manufacturers like MB recommend a certain break-in technique?
    To protect themselves. As stated, if there were any shavings that got in the motor it would fail and they would have to cover it. Telling you to baby it before the oil change reduces the chance of failure.

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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    So any thoughts on why some auto manufacturers like MB recommend a certain break-in technique?
    More often than not, its to break in certain components in the driveline like the differential. As stated, most of these modern high performance motors are already run in at the factory. I know on my CLK BS the shop foreman told me that the suggested break in period was for the rear locking dif. Note I said, "suggested". Click here to enlarge

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    Click here to enlarge Originally Posted by LZH Click here to enlarge
    More often than not, its to break in certain components in the driveline like the differential. As stated, most of these modern high performance motors are already run in at the factory. I know on my CLK BS the shop foreman told me that the suggested break in period was for the rear locking dif. Note I said, "suggested". Click here to enlarge
    Driveline components is a good point as well.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    To protect themselves. As stated, if there were any shavings that got in the motor it would fail and they would have to cover it. Telling you to baby it before the oil change reduces the chance of failure.
    I understand your point about the shavings. I dont recall if the C63 ( as an example) was supposed to get an oil change around 1500 miles, which is around when the break-in period would have been over. I'M gonna check the manual when I have a minute.

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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    I understand your point about the shavings. I dont recall if the C63 ( as an example) was supposed to get an oil change around 1500 miles, which is around when the break-in period would have been over. I'M gonna check the manual when I have a minute.
    Let me know when they recommend it. I'm just familiar with the BMW break in procedure and they also change the diff oil as well at around 1500 or so.

    Regardless, all of these motors are thoroughly tested.

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    Click here to enlarge Originally Posted by LZH Click here to enlarge
    More often than not, its to break in certain components in the driveline like the differential. As stated, most of these modern high performance motors are already run in at the factory. I know on my CLK BS the shop foreman told me that the suggested break in period was for the rear locking dif. Note I said, "suggested". Click here to enlarge
    Yeah, good point about the rest of the driveline. At least in theory... Click here to enlarge

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Let me know when they recommend it. I'm just familiar with the BMW break in procedure and they also change the diff oil as well at around 1500 or so.

    Regardless, all of these motors are thoroughly tested.
    I'll update. Re: the diff oil change for the C63 only the LSD requires the early fluid change. I imagine the Bimmer only comes with LSD (the way it should be).

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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    I'll update. Re: the diff oil change for the C63 only the LSD requires the early fluid change. I imagine the Bimmer only comes with LSD (the way it should be).
    Yes, the M cars have LSD's.

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    I'm one of those guys who break-in the cars for the driveline components as Mr. Luke said. They do break-in the engines in the factory only.

    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    the diff oil change for the C63 only the LSD requires the early fluid change.
    C63 doesn't have LSD?!
    Last edited by Sorena; 08-21-2012 at 02:04 PM.

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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    C63 doesn't have LSD?!
    Only as an option.
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    1 out of 1 members liked this post. Yes Reputation No
    So, I checked the owner's manual. It didn't specifically state to change the oil at some point in time. It tells you to follow the reminder from your vehicle. Note, I could have missed something, but I checked the manual pretty good.

    It does say -- in the break-in section -- to follow their suggestions (e.g., don't rev over 4500 rpms, don't lug the motor, etc.) even if you change the engine or differential at 1000 miles. Notice, I didn't say "engine oil" or "differential oil." That's because the manual doesn't include the word "oil." I'm guessing it's a typo.

    You could sort of infer that an engine oil of diff oil change is okay at 1000 miles, but it doesn't say to do that. Pretty strange wording if you ask me.

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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    C63 doesn't have LSD?!
    Yeah, what the hell, right?

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    Does AMG have the time and resources to do this procedure for every engine they produce? Seems overly time consuming.

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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    Yeah, what the hell, right?
    Click here to enlarge Originally Posted by PetroC63 Click here to enlarge
    Only as an option.
    Well that's odd. My uncle had a 230SL and that car had limited slip diff! The 6.3 SEL from 60's had it. Why they didn't offer it as standard in C63?

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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    Well that's odd. My uncle had a 230SL and that car had limited slip diff! The 6.3 SEL from 60's had it. Why they didn't offer it as standard in C63?
    I guess just a business decision. Many buyers don't think about it or know about it. So, MB can make a little extra coin by selling it as an option. I assume dealerships would prefer to order the car without the option because it makes the car less expensive for prospective buyers.

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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    I guess just a business decision. Many buyers don't think about it or know about it. So, MB can make a little extra coin by selling it as an option. I assume dealerships would prefer to order the car without the option because it makes the car less expensive for prospective buyers.
    +1

    I was just about to say the same. Definitely a cost driven decision.
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    Click here to enlarge Originally Posted by Sonny Click here to enlarge
    Does AMG have the time and resources to do this procedure for every engine they produce? Seems overly time consuming.
    AMG does not produce a high volume of engines, and I imagine there is a decent profit margin on each one.

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by andrew20195 Click here to enlarge
    AMG does not produce a high volume of engines, and I imagine there is a decent profit margin on each one.
    Depends on what you call high volume.

    By my count they made approx 14,264 M156 motors. And that is just for the United States.

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