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Thread: 5W40 Vs. 15W40 Oil?

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  1. Top Of Page | #1
    Loud 03's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    The 5th Gens have roller rockers.

    This is the reason for the thinner oils.

    The 4th Gens and older have flat tappets, so 15W-40.

    Just my two cents


    Sent from my iPhone using Tapatalk


  2. Thanks IGOTACUMMINS, watersupply189 thanked for this post
  3. Top Of Page | #2
    IndyRamMega's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    Quote Originally Posted by Loud 03 View Post
    The 5th Gens have roller rockers.

    This is the reason for the thinner oils.

    The 4th Gens and older have flat tappets, so 15W-40.

    Just my two cents


    Sent from my iPhone using Tapatalk
    Not roller rockers but hydraulic lifters.

    The roller part doesn't matter the 15w oil is supposedly too thick and will clog the oil orifice on the lifter.

    Mine has been converted and is running jesel solid roller lifters 15-40 oil for me.

    21 2500 6.7 4x4 MC....Thuren Coils - Thuren Front & Rear TB's-Thuren FSB- Fox 2.0 Shocks - Amsoil Bypass - Fleece Coolant Bypass - S&B Intake - Banks Diff Cover - Ram Horn and Grid Heater Delete - BMP Fuel Filter Conversion - ARP 625's - Wagler Cam/Solid Lifter Conversion - Hardened Valve Seats - Billet Freeze Plugs - Manton Pushrods - Fuel 18 x 9 +1 Beast Wheels - Nitto Recon Graps - Power Stop Z36 Brakes - KLM Braided Brake Lines - Revmax 700 - ATS TB Delete - Baja Designs Fog Lights - Airlift 7500 Bags - Daystar Cradles - Dynatrac Ball Joints - Synergy DL/TR - 4.10's -

  4. Thanks watersupply189, AK Bob, Corkey, IGOTACUMMINS thanked for this post

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