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Motor Oil question

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Taxi/Limo, Oct 28, 2022.

  1. Taxi/Limo

    Taxi/Limo Active Member

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    I read an article about Motor Oil and it said what you should use depends on the age of the engine, your climate , your driving habits etc.

    What is the best choice for a gen 3 engine at about 84k miles slow acceleration driving at or under the speed limit in California whick gets very hot in summer but not very cold during winter.?
     
  2. Tombukt2

    Tombukt2 Senior Member

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    The 020 covers you pretty good for that weather it's very similar to what we have here in North Carolina I don't think you're going to do much better than that if it gets extremely hot you could go up to the maybe the 30 during the summer but probably no need.
     
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  3. jzchen

    jzchen Newbie!

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    Mobil 1 EP High Mileage, weight as designated in owners manual.

    REVVL V+ 5G ?
     
  4. Grit

    Grit Senior Member

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    Stay away from high mileage up until your leaking from seals.
     
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  5. Mendel Leisk

    Mendel Leisk Senior Member

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    Yup, high mileage oils are kinda like methadone maintenance: once on it there’s no going back. They swell seals, should only be used if you have runaway oil consumption.

    Oil pick: any decent quality 0W20. I’ve been using Toyota up to now, but price just went through the roof, so switched to Costco’s Kirkland stuff. Seems ok
     
  6. Grit

    Grit Senior Member

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    If your in Arizona and closer to the equator, go w/ 5w 30. In SF, 0w20 or 5w20. SF is not like North Carolina, we don’t start engines below 40 degrees in the coldest winter.
     
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  7. Taxi/Limo

    Taxi/Limo Active Member

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    Okay
    What's the difference btwn 0-30 and 5-30? Thanks
     
  8. Tombukt2

    Tombukt2 Senior Member

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    I meant on the heat side of things y'all are starting to write regularly see our heat temperatures I'm well aware you don't see our cold to me super hot is super hard on super lightweight oils so if you're in the hundreds of degrees you know like 105 right regular You're at the upper end of the range for 20 aren't you You're right up there in the very upper end of the range of heat for 20 white oil if I'm not mistaken or you used to be I haven't looked at the stuff in a long time now they have oil as thin as water that they say will working 110° weather kind of makes me nervous being on the upper end of the scale of the fluids capability in the first place but that's how they've engineered all this now they're running everything at the bleeding edge so there's no headroom same with your radiator temps one little thing happens and boom you're in 295° instantly but that's how they like things now so one little thing happens and you need $4,000 worth of repair That's not how this used to go
     
  9. Tombukt2

    Tombukt2 Senior Member

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    In Central North Carolina down in the 40s is pretty normal for our winter It gets colder than that but around the 40s is pretty much normal It might go down into the teens late at night but by the time most folks are getting up getting dressed and getting ready to head off to work it's above 36 heading to 40 and probably be 55 that day midday in January happens quite a bit when I first moved down here in '83 it was 75 at Christmas and I was installing air conditioning in my 74 Corolla SR5 no kidding
     
  10. CR94

    CR94 Senior Member

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    The proper designations are 0W-30 and 5W-30.
    By definition, 0W-anything doesn't become too thick to allow cranking an engine at -35°C (~-31°F).
    5W-anything doesn't become too thick to allow cranking an engine at -30°C (~-22°F), but does become too thick at -35°C.

    See SAE J300 viscosity specs for further detail on viscosity limits of engine oil grades.
     
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  11. Taxi/Limo

    Taxi/Limo Active Member

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    Okay
    And the 30?
     
  12. Grit

    Grit Senior Member

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    You should take your car to dealerships for oil changes if you’re not proficient with oil weight specs.
     
  13. CR94

    CR94 Senior Member

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    Means the oil falls within a certain viscosity range at a temperature of 100°C and stays above a specified viscosity under conditions of the High Temperature, High Shear rate test. See a chart of SAE J300 for further detail.
     
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  14. Taxi/Limo

    Taxi/Limo Active Member

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    That's not going to happen
     
  15. rjparker

    rjparker Tu Humilde Sirviente

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    There is one answer, 0w20. If you can't get it, use 5w20 and replace it soon with the right oil.

    DA2DB44D-585B-45A6-8E53-AB0A76F321E4.jpeg
    and

    5841A7FF-EFDC-4285-9432-7A6FA2330BE2.jpeg
     
    #15 rjparker, Nov 3, 2022
    Last edited: Nov 3, 2022
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  16. jzchen

    jzchen Newbie!

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    Per literature kindly posted by @rjparker, Toyota agrees:

    0W-20 is best for fuel economy and cold starting ability.

    Something higher than 20 may be beneficial (in the second spec #).

    So one should alternate between 0W-20 every 10k mi/1 yr, and 0W-(your choice), but change at 5k mi/6 mo intervals? (This is the literal translation of that manual page)


    iPhone ?
     
  17. sam spade 2

    sam spade 2 Senior Member

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    This recommendation from Toyota never made any sense to me.
    There is NO one "right" oil.
    The difference between 0W and 5W is so tiny that I suggest you would not be able to tell any difference, even after more than 100K miles
    of continuously using the "wrong" oil.
     
  18. RRxing

    RRxing Senior Member

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    My 2022 Venza uses 0W-16 oil and has the same precaution if using 0W-20...

    Screenshot 2022-12-04 at 11.17.29 AM.png
     
  19. Mendel Leisk

    Mendel Leisk Senior Member

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    Could be Toyota's just doing cut-and-paste with various oil weights, and change intervals? I find it hard to take this too serious.
     
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  20. jzchen

    jzchen Newbie!

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    This is a pretty new, high mileage oil test:



    (I haven’t finished watching yet)…