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New W900L - Cummins ISX15 Break In Period Tips

Discussion in 'Experienced Truckers' Advice' started by OhNoTerry, Mar 24, 2022.

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  1. Mar 24, 2022 #1
    OhNoTerry

    OhNoTerry Medium Load Member

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    Any of you guys have any pro tips on how to handle the break in period of these newer trucks? Some have said to give her hell with the first 25-50k miles, some say drive it as you would normally. ISX Productivity Series motor with 565/1850, 18 speed Eaton tied to 3.36 rears on 22.5 LP tires. We run out of WA state so I figured all these weekly hill climbs and driving like I normally would, would be break in enough.

    Truck will be in my hands sometime next week, what are some things I should do right out the gate? Besides, you know.. adding a stripper pole to the sleeper. lol
     
    OhNoTerry, Mar 24, 2022
    OhNoTerry, Mar 24, 2022
    #1
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  3. Mar 24, 2022 #2
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    First thing is to join Rawze.com and read up.Why the fast gears?
     
    Dadetrucking305, Mar 24, 2022
    Dadetrucking305, Mar 24, 2022
    #2
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  4. Mar 24, 2022 #3
    OhNoTerry

    OhNoTerry Medium Load Member

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    According to the spread sheets, that puts me around 1450 rpm on top gear at 67ish mph. Right where I wanted to be.
     
    OhNoTerry, Mar 24, 2022
    OhNoTerry, Mar 24, 2022
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  5. Mar 24, 2022 #4
    Dadetrucking305

    Dadetrucking305 Heavy Load Member

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    Cummins need to be at 1500 and above more longevity of the engine.Torque kills them.Definitely check out Rawze.com and all this will be explained in detail.
     
    Dadetrucking305, Mar 24, 2022
    Dadetrucking305, Mar 24, 2022
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    OhNoTerry Thanks this.
  7. Mar 25, 2022 #5
    OhNoTerry

    OhNoTerry Medium Load Member

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    I will for sure check him out, I’ve heard his name come up a lot in regards to Cummins. This was my first spec so I’ll keep you guys updated on if I’m fond of the cruising gear in relationship to speed and RPM.
     
    OhNoTerry, Mar 25, 2022
    OhNoTerry, Mar 25, 2022
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  8. Mar 25, 2022 #6
    abyliks

    abyliks Road Train Member

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    the 855s did, I thought the new x15s were low rpm engines, not really all that fast a gears on lp22.5s….
     
    abyliks, Mar 25, 2022
    abyliks, Mar 25, 2022
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  9. Mar 25, 2022 #7
    Long FLD

    Long FLD Road Train Member

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    On paper the X15 is a low rpm engine.
    26979432-B120-4926-A680-AB5B9345EA67.png
     
    Long FLD, Mar 25, 2022
    Long FLD, Mar 25, 2022
    #7
  10. Mar 25, 2022 #7
    krupa530

    krupa530 Light Load Member

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    Got a 565/2050. Dropped a liner at 555559. Used to keep it around 1400. I know on paper they’re supposed to be a low rpm engine but I beg to differ.
     
    krupa530, Mar 25, 2022
    krupa530, Mar 25, 2022
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  11. Mar 25, 2022 #8
    Judge

    Judge Road Train Member

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    That’s why you don’t abuse them new.
    For the first week on a new engine I don’t go over 60, set cruise and ride, all seals gaskets are new and stiff.
    Next week go to 65.
    Then whatever you want, but I get best mpg at 66 with3.36 rears.
     
    Judge, Mar 25, 2022
    Judge, Mar 25, 2022
    #8
  12. Mar 25, 2022 #9
    Dave1837

    Dave1837 Road Train Member

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    Hated the 3.36/18 speed combo I drove. It was an X15 565/1850 in a W9. 18th gear was worthless cause it died under 1500 rpms. Even on the Ohio turnpike I was downshifting
     
    Dave1837, Mar 25, 2022
    Dave1837, Mar 25, 2022
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  13. Mar 25, 2022 #10
    OhNoTerry

    OhNoTerry Medium Load Member

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    Yeah, that's something my salesmen was pretty heavily versed in. Said Cummins is aiming for lower RPM cruise motors. Granted he is a salesman, but I for sure as hell wasn't going for the Paccar MX motor. lol
     
    OhNoTerry, Mar 25, 2022
    OhNoTerry, Mar 25, 2022
    #10
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