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Proper break-in for MMR short block

Discussion in 'Engine/Tuning' started by fuelforfire87, Apr 12, 2019.

  1. fuelforfire87

    fuelforfire87 Active Member Established Member

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    So I finally received my MMR 1000 short block and while I am waiting for it to be installed I am trying to figure out the best break-in procedure. I looked at the documentation that came with the block and it says change the oil after the first 400 miles (will be using a amsoil break-in oil). It also states synthetic oil cannot be used for the first 6000 miles. Why would this be? I looked at a few other engine builders and their break-in procedure said nothing about not using synthetic oil, one company even recommended switching to synthetic after the break-in period. What is your opinion? And if it’s true that I can’t use synthetic, what oil should I use while the the car is being tuned on the dyno? I’m looking to make 800-850 whp with my procharger setup on E85 and would worry about not having a proper full synthetic oil like amsoil or royal purple in the motor while doing so.
     
  2. fuelforfire87

    fuelforfire87 Active Member Established Member

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  3. oldstv

    oldstv Well-Known Member Premium Member Established Member

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    I can't speak for car engine builders but in the outboard boat racing world we used a nickel cell cylinder coating. If we used synthetic oil during break-in it would take much longer for the rings to seat, and every now and then it would take way too long. When using the standard TCW3 oil the rings would come in very quickly.
     
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  4. ashleyroachclip

    ashleyroachclip Well-Known Member Established Member

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    The synthetic is too slick for rings to seat .
    If you like spending money , break it in with the synthetic oil ,,,,, and do it again and again .
    The mmr instructions are easy to understand , and there for a reason .
     
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  5. fuelforfire87

    fuelforfire87 Active Member Established Member

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    What if you use break-in oil though for the first 1000 miles? From what i understand break-in oil is not synthetic. Wouldn't the rings be fully seated by then?

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  6. ashleyroachclip

    ashleyroachclip Well-Known Member Established Member

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    As you said MMR specifies an oil change in .....
    ...500 miles .want to wait a thousand to change the breaking oil ....go ahead .
    Then you can buy another engine , and go through this again .....
     
  7. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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  8. DSG2003Mach1

    DSG2003Mach1 Well-Known Member Premium Member Established Member

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    if you want to maintain whatever warranty they are offering I would stick to their break in procedure.
     
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  9. fuelforfire87

    fuelforfire87 Active Member Established Member

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    Makes sense, i will probably call MMR on monday and see what they have to say.

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  10. fuelforfire87

    fuelforfire87 Active Member Established Member

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    Well i called MMR today, you guys were right, the reason for not using synthetic oil is so the rings seat properly. So looks like i'll be following their recommendation and using regular dino oil then.

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  11. 2012 Boss 302

    2012 Boss 302 Member Established Member

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    Wow.....
     
  12. fuelforfire87

    fuelforfire87 Active Member Established Member

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    Wow on the fact that i have to use regular oil for 6k miles? I talked with the guy building my engine and he thought it was excessive too. I looked a couple other companies break in procedures and they recommend using break-in oil for the first 500 miles and after like 1500 switch to synthetic. I paid extra for the extended warranty though so i dont want to void it.

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  13. Flcracker

    Flcracker Active Member Established Member

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    29D86225-D98E-43DB-AE95-CE2E9F7CC580.jpeg Here’s what I got. Step 9 has break in oil being used until 800 miles. Do your instructions require you to examine the oil filter? I am going to be following my instructions to the letter.
     
    Last edited: Jun 23, 2019
  14. HISSMAN

    HISSMAN The Great Bearded One Staff Member Super Moderator

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    Standard oils for 500 miles. Then I run synthetic. I keep it simple stupid.
     
  15. fuelforfire87

    fuelforfire87 Active Member Established Member

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    No MMR doesnt say anything about examining the filter. Still waiting to get my car back but my builder is putting amsoil break-in oil so those rings seat quick

    Sent from a Chevy S10+
     
  16. scotmach

    scotmach Well-Known Member Established Member

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    6000 miles is excessive to run regular oil. But if that's what they want so be it.
     
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  17. SHIFTYBUSINESS

    SHIFTYBUSINESS Active Member Established Member

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    I used Joe Gibbs break in oil for 400mi then Mobil 1. Its a MPR short block coyote. From day one VMP gen2 85mm pulley after 1000mi droped to 79mm pulley. The engine doesn't use any oil between changes and doesn't smoke. Runs great and I'm 10k miles after the install.

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