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Thread: Oil Changes

  1. #1
    Join Date
    Mar 2010
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    55

    Default Oil Changes

    What is a good interval to change oil. Presently using 15w40, would consider syn 5w40.
    How often do the 18 wheelers change there oil and what filtration differences are installed on there rigs? I understand the capacity in higher.....
    07 Chevrolet 2500 NBS LTZ 4x4 6.5'Box xCab

  2. #2
    Join Date
    Apr 2001
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    CA
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    Arrow

    There is no comparison. 10 qts. vs. 10 gallons, completely different engine designs and operating parameters, and completely different usage.

    REAL synthetic oil (Mobil, Amsoil, Redline, Royal Purple, etc.) can extend service intervals 50-100%. The rest should be changed according to mfg. suggested use interval. Environmental and duty conditions should decide that. Improved oil filtration (duals, bypass, etc.) can help extend further, but not nearly as much as it's marketed. Extended service intervals is ecological, though.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Dec 2002
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    Teton Valley, Idaho
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    Default

    I use 15-40 dinosaur oil and change it when the DIC asks me to, about every 10K. Keep in mind that if you start to use synthetic oil you'll see every tiny leak in your engine and judging by your posts that might bother you a bit.

    210,000 miles on my LLY and no sign of engine wear, FWIW.

  4. #4
    Join Date
    Jan 2006
    Location
    South Milwaukee, WI
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    245

    Default oil changes

    On my LB7, I've been predominantly running the T6 Rotella (5W-40) and change the filter every 4K, oil and filter every 8K. Lab tests have not indicated any coolant, water or fuel in my oil. Been running this for about 14 years now; 400,700 miles- not seeing any leaks or problems.
    "Chessy56"
    So. Milwaukee, WI
    '01 2500HD, LB7, ~440K miles
    "Stock" engine. Dual fuel filtration system with Kennedy lift pump, BF Goodrich Commercial T/A Traction tires (sold to a dude from Texas- it's living a warmer life just fine down there now!).

    '17 2500HD, L5P (Happy Birthday/Merry Christmas to me!!!) Currently bone stock, 120K miles.

    "Socialism is a philosophy of failure, the creed of ignorance and
    the gospel of envy. Its inherent virtue is the equal sharing of misery."
    Winston Churchill

  5. #5
    Join Date
    Mar 2000
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    Loyal WI US
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    10,792

    Default

    Mobil Delvac 1 5w40 every 10k on the tens works for me. I'm sure I could go longer and I have gone 12k+ but the 10 on the 10's is easy to remember.
    Kennedy Diesel-owner
    More than just a salesman-I use and test the products that I sell on a daily basis!
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  6. #6
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    Apr 2001
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    Quote Originally Posted by Kennedy View Post
    Mobil Delvac 1 5w40 every 10k on the tens works for me. I'm sure I could go longer and I have gone 12k+ but the 10 on the 10's is easy to remember.
    Yeah. That's pretty much what I do. No regrets. No issues.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  7. #7
    Join Date
    Feb 2000
    Location
    Maplesville, AL - Home Base
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    536

    Default

    Rotella here and change it and the filter every 5,000. Maybe a little overkill, but cheaper than a new engine. No synthetic either. 160,000 so far.
    Ed
    KM4STL

    '06 Sierra LBZ 4x4 Crew SB, Titan 52 gallon fuel tank, TTT/Schefenacker Mirrors
    '98 Suburban, 245,000 - sold 7-4-06

  8. #8
    Join Date
    Feb 2000
    Location
    Montana
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    Default

    Figuring out what the best oil drain/filter change interval might be depends on how you use your truck and how long you tend to keep a vehicle.

    If you work your truck hard in either extreme heat or extreme cold, choosing a quality synthetic is a no-brainer.

    If you tend to trade vehicles every 5 or less years, using synthetic is just helping the next owner - assuming synthetic actually provides less wear over time (I think it does). Same goes for shortening the factory recommended service intervals.

    The only "must" here is that you must service the vehicle according to the factory recommended service intervals (or more often) using spec/certified products to maintain the factory warranties.

  9. #9
    Join Date
    Feb 2000
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    Maplesville, AL - Home Base
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    536

    Default

    I changed my oil/filter with Rotella yesterday. I had gone over my 5,000 internal by 350 miles. I hope the engine doesn't completely disintegrate as a result (smile). During the past 5,000 miles I did tow heavy about 3,000 of it. I know I heard the engine sigh when I first started it with the new oil/filter in it or maybe that was me? Who knows.
    Ed
    KM4STL

    '06 Sierra LBZ 4x4 Crew SB, Titan 52 gallon fuel tank, TTT/Schefenacker Mirrors
    '98 Suburban, 245,000 - sold 7-4-06

  10. #10
    Join Date
    May 2013
    Location
    Fl
    Posts
    6

    Default

    I change my oil every 5k or 6months whichever comes first. I like using Mobil.

  11. #11
    Join Date
    Mar 2000
    Location
    St. George, Utah.
    Posts
    980

    Default

    Some controversy as to whether Mobil 1 oils are a true synthetic. I use them in all but my Dmax in which I use Mobil 1300. I've had no problems and also use Mobil filters.
    Thoughts?
    2018 GMC Denali HD 2500 L5P.

  12. #12
    Join Date
    Mar 2000
    Location
    St. George, Utah.
    Posts
    980

    Cool

    No opinions here?
    2018 GMC Denali HD 2500 L5P.

  13. #13
    Join Date
    Mar 2000
    Location
    Owego, NY
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    1,929

    Default

    Inspector,

    I used to follow the oil discussions in the early days over on bobistheoilguy.com and back then it was commonly understood that M1 base stocks were "true synthetic" GROUP IV PAO. So when I saw your post I did some google searches and was surprised to find that apparently M1 had began utilizing group III base stocks in their formulations. The following thread is one example of discussions on this topic..

    http://www.bobistheoilguy.com/forums...Number=1990677

    Given M1's reputation as a quality lube I'm not sure this isn't a good development.. seems like UOA results with these lubes would be the test to say good or bad..
    Bill
    03 2500HD D/A CC/SB/4WD,OilGuard, MegaFilter,LiftPump/PreFilter, Bilsteins,RetraxRollTop,J&J Boards,Coolant Filter,AlliDeepPan,FastIdle,AllHeadLightsOn,
    98 K3500 6.5,SOLD

  14. #14
    Join Date
    Mar 2000
    Location
    St. George, Utah.
    Posts
    980

    Question

    The article was an eye opener. How can the consumer tell what Mobil 1 oil is a "Visom", grpIII PAO or grpIV/V? Is there an explanation on the bottle or some other indication as to what I am buying? This is very confusing.
    Thanks for posting that link.
    Denny
    2018 GMC Denali HD 2500 L5P.

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