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Thread: 5W40 Vs. 15W40 Oil?

  1. Top Of Page | #11
    I WILL STAND! AK Bob's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    Quote Originally Posted by rsl0311usmc View Post
    What's everyone's oil change interval mileage?

    I am curious.

    I won't lie. Even running the bypass and Amsoil, I hate letting it get near 25 percent oil life on the dash and probably do overkill oil changes.
    I am also running the Amsoil BP90 bypass filter.

    I change all filters, oil, and fuel every 12 months because I drive less than 10K miles annually.

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  3. Top Of Page | #12
    Watch Dog! Corkey's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    Mines done between 4500 to 8k.

    I would rather pay for the oil changes with the additional stabilizer than dig into the bottom end or need a short block to build.

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX

  4. Top Of Page | #13

    Re: 5W40 Vs. 15W40 Oil?

    You all sound like me.

    I appreciate the feedback.

    It sounds like I am not crazy with my oil changes, haha.

    I can't afford to have my truck down because I haul with it when we get hay, so I would instead do overkill.


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  6. Top Of Page | #14
    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


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  8. Top Of Page | #15
    sdjimbo's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    Quote Originally Posted by AK Bob View Post
    I follow the recommended oil type and weight in my owner's manual.

    For me, it’s Rotella T6, 5W40 year round.

    The oil weight should be selected based on the anticipated operating temperature range.

    Attachment 16578
    What year is your truck?


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  10. Top Of Page | #16
    I WILL STAND! AK Bob's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    Quote Originally Posted by sdjimbo View Post
    What year is your truck?

    Sent from my iPhone using Tapatalk
    Mine is a 2014, 3500.

    See signature.

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  12. Top Of Page | #17
    Aj Grubb's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    My truck has never had anything but 5W40 T6 since I have owned it.

    I live in Middle Tennessee.

    We see temperatures ranging from -10F in the winter to over 100F in the summer.

    If my truck is running, it's usually towing or hauling something.

    Plenty of long-haul towing at high speeds in the summer heat.

    T6 5W40 works great at every temperature range a person in the United States is likely to encounter.

    I change my oil every 10k miles with 5W40 T6, and that's it.

    You don't need to put any more thought into it than that.

    Just my .02$


  13. Top Of Page | #18
    DaFuzz80's Avatar

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    Re: 5W40 Vs. 15W40 Oil?

    I have a 2016 2500 and use it hard. I run T6 15W40. If it's -20 or colder my truck doesn't shut off so cold pourability isn't as big of a factor.

    I do oil analysis and change my oil every 25,000. I sold my last RAM when it hit 565,000 and this one has 300,000 using this interval with good analysis supporting the 25k changes.

    Last edited by DaFuzz80; 2 Weeks Ago at 09:37 PM. Reason: Don't change my sentence structure

  14. Top Of Page | #19
    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 - DRD Tuned - Fuel 18 x 9 +1 Beast Wheels - Nitto Recon Graps - Power Stop Z36 Brakes - KLM Braided Brake Lines - Revmax Zero Flex VB and Deep Pan - ATS TB Delete - Baja Designs Fog Lights - Airlift 7500 Bags - Daystar Cradles - Dynatrac Ball Joints - Synergy DL/TR - 4.10's -

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