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Dangerous question

Discussion in 'Wrangler TJ (1996-2006)' started by The4x4Guys, Apr 21, 2019.

  1. Apr 21, 2019 at 7:16 PM
    #1
    The4x4Guys

    #1
    The4x4Guys [OP] Well-Known Member

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    I know asking about oil preferences is like asking about political or religious preferences, but I'm going to tempt fate by asking.

    What is the preferable oil to run in a 208k miles 2003 TJ 4 liter engine? I don't know what the prior owner ran, but it may be too late in its life to switch to synthetic but what weight for Texas summers and winters is suggested?
     
    The4x4Guys, Apr 21, 2019
    #1
  2. Apr 21, 2019 at 8:02 PM
    #2
    aggrex

    #2
    aggrex Well-Known Member

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    Up north I've used 5W30 synthetic year round with no issues on various engines. High mileage 4.0 with possible RMS leak and high Tex temps could use 10W30 following jeep specs. Son's '97 Avalon @171k started 5W30 synthetic @95k with no issues or leaks. IMO start with dino oil for the first OCI and observe whether you have any oil consumption or oil leaks or any misc engine issues as the project begins.
     
    aggrex, Apr 21, 2019
    #2
    JKBob 25 likes this.
  3. Apr 21, 2019 at 8:06 PM
    #3
    The4x4Guys

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    The4x4Guys [OP] Well-Known Member

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    that sounds like sound advice. All fluids will be topped off tomorrow. Once the valve cover and gasket shows up, then a full oil change will be in order.
     
    Last edited: Apr 22, 2019
    The4x4Guys, Apr 21, 2019
    #3
  4. Apr 21, 2019 at 9:49 PM
    #4
    Harleymick

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    Harleymick Well-Known Member

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    Didn't you already say it was marking its territory? Usually, if there are no leaks synthetic will not cause one and will give you extra protection because it is slicker. If there is a leak it will likely make it worse. I have a suggestion that will likely cause indigestion for some and if so that is fine. As you said about politics and religion.

    You change your oil about what, every 4 - 5k miles? I going to tell you how to add another 1k :eek: and protect it better. Say you go to 6k between oil changes with whatever oil you choose for your locale. Every 3k change the filter, that's where the dirt is. ;) In other words, change the filter every 3k and the oil every 6k. OK guys, lets have it. :smack:
     
    Harleymick, Apr 21, 2019
    #4
  5. Apr 22, 2019 at 5:36 AM
    #5
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    I run either Valveline 10w30 high mileage (synthetic blend) or Rotella T 10w40, supposedly it has more ZDDP (Zinc) than other oils which is better for the flat tappet engine. If I run the 10w40 it is in the summer only.
     
    Prerunner1982, Apr 22, 2019
    #5
  6. Apr 22, 2019 at 6:09 AM
    #6
    TJ_abuser

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    TJ_abuser Well-Known Member

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    I run Castrol 10w30 synthetic blend my wife runs Castrol full synthetic in her FJ cruiser
     
    TJ_abuser, Apr 22, 2019
    #6
  7. Apr 22, 2019 at 6:54 AM
    #7
    boondoc89

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    boondoc89 Well-Known Member

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    I see no problems using full synthetic oil in higher mileage motors. They do make a high mileage synthetic for older wore in motors as well. I'd imagine a 5w30 would be just fine for Texas temperatures
     
    boondoc89, Apr 22, 2019
    #7
    TJ_abuser likes this.
  8. Apr 22, 2019 at 7:35 AM
    #8
    The4x4Guys

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    The4x4Guys [OP] Well-Known Member

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    That actually sounds reasonable to me. My goal (if possible) is to avoid having to replace or rebuild the engine for a while. The debate in my head is synthetic or dino after I change out the valve cover gasket and do a general clean up. I'm headed out to the driveway today to contort myself under the Jeep to see if I can trace the leak.
     
    The4x4Guys, Apr 22, 2019
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  9. Apr 22, 2019 at 9:35 AM
    #9
    Harleymick

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    Harleymick Well-Known Member

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    I ran Mobile 1 full synthetic for years and was happy with it. With the new engine Comp Cams told me to run Valvoline 10w-30 racing oil with zinc. I'm not sure what I'll run after the break in is over but I will stay with zinc for this cam.
     
    Harleymick, Apr 22, 2019
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  10. Apr 22, 2019 at 7:48 PM
    #10
    JKBob 25

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    JKBob 25 Well-Known Member

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    When I bought my JK, manufactured for 5 - 20. So I stuck with that, but full synthetic. I ran 10 - 30 full syn in my XJ for 13 years. And never an issue. Yup...maned for 10 - 30
     
    JKBob 25, Apr 22, 2019
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    Harleymick likes this.
  11. Apr 23, 2019 at 6:24 AM
    #11
    OFFGRID

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    OFFGRID Well-Known Member

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    I have never been picky about oils. I follow the recommendation of the car manufacturer for viscosity, and feel it is important to try not to change brands too often. A couple of years ago I found a company that distributes 5 gallon to 100 gallon barrels and I purchase their 5 gallon barrel of synthetic blend in the viscosities that I need. I have 5w20, 5w30, 10w30, and gear oil. They run about $45 a barrel.
     
    OFFGRID, Apr 23, 2019
    #11
    JKBob 25 likes this.
  12. Apr 23, 2019 at 2:12 PM
    #12
    TJ_abuser

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    TJ_abuser Well-Known Member

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    Wow great price
     
    TJ_abuser, Apr 23, 2019
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