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Mixing Oil Weights?

Discussion in '5th Gen 4Runners (2010-2024)' started by ecoterragaia, Apr 2, 2022.

  1. Apr 2, 2022 at 9:26 AM
    #1
    ecoterragaia

    ecoterragaia [OP] New Member

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    Hey folks, tried searching to no avail.

    I'm in the middle of doing an oil change on my '21 SR5 and realized that I'd only bought 6 qts of 0W-20 oil. I'm also planning on changing the oil in my Tacoma today and it takes 5.5 qts of 5W-30.

    Instead of heading out for that last 0.5 qts of 0W-20 for the 4R, do you think I could add the leftover half quart of 5W-30 from the Tacoma's oil change and call it good?

    I'm asking because, if this is okay, it would save me from having to throw away a half quart of 0W-20 AND half a quart of 5W-30 every time I changed oils. Both oils are full synthetic Pennz. Platinum.

    Thanks!
     
    Last edited: Apr 2, 2022
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  2. Apr 2, 2022 at 9:28 AM
    #2
    Thatbassguy

    Thatbassguy New member? Really??

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    I would. The manual recommends 5w/30 for some circumstances, so it shouldn't hurt anything.
     
  3. Apr 2, 2022 at 9:43 AM
    #3
    ecoterragaia

    ecoterragaia [OP] New Member

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    Thanks, I was kind of thinking it wouldn't be a big deal with only half a quart, especially with summer coming up.
     
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  4. Apr 2, 2022 at 10:06 AM
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    TRDLE

    TRDLE New Member

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    Why would you throw it away, though? Leave the half quart in your garage for the next oil change...
     
  5. Apr 2, 2022 at 10:08 AM
    #5
    Thatbassguy

    Thatbassguy New member? Really??

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    Good point. For awhile I was just buying the 5 quart jugs and saving the remainder for the next change.
     
  6. Apr 2, 2022 at 12:31 PM
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    ecoterragaia

    ecoterragaia [OP] New Member

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    I don't like using oil that has been unsealed and sitting in a non-temperature-controlled environment for 6+ months. I know, it logically doesn't make sense.
     
  7. Apr 2, 2022 at 12:46 PM
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    Trail Runnah

    Trail Runnah New Member

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    Your engine is a non-sealed, non-temperature controlled environment.
     
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  8. Apr 2, 2022 at 12:50 PM
    #8
    ecoterragaia

    ecoterragaia [OP] New Member

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    I know, that's why I'm changing the oil ;)

    Edit: My oil changes are typically based on length of time since last oil change rather than mileage.
     
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  9. Apr 2, 2022 at 2:28 PM
    #9
    08TXRunner

    08TXRunner New Member

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    That's sig material.
     
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  10. Apr 2, 2022 at 2:44 PM
    #10
    LandCruiser

    LandCruiser I have Toyotas

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    Won’t make a difference.
     
  11. Apr 2, 2022 at 5:20 PM
    #11
    ecoterragaia

    ecoterragaia [OP] New Member

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    I'm guessing you guys forgot that there are recommended timespan limits between oil changes? For many vehicles, like the 2TR-FE in my Taco, it's 5,000 miles OR 6 months (i.e. regardless of mileage, including zero). For the 4R, it's 10,000 miles, or once per year. If Toyota doesn't recommend letting oil sit in an engine unused over a certain period of time, why would it be any better in an unsealed bottle?
     
  12. Apr 2, 2022 at 5:30 PM
    #12
    Snickel Fritz

    Snickel Fritz Do not develop this member's app

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    Regardless of how much potential for catastrophe is involved, you have to try it now. Please install seventeen 8K cameras around and inside the engine, sprinkle some chalk on it, and do a video to update us.
     
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  13. Apr 2, 2022 at 5:57 PM
    #13
    RoadtripJim2000

    RoadtripJim2000 New Member

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    Ever think of just putting the same weight oil in both engines? 5W 20 or 5W 30 and just stay with it. You are not dealing with temp extremes like northern climates so cold weather start ups are not an issue and full synthetic oils don’t turn to paste like conventional oils at -40 degrees. It would save you a lot of headaches. There a quite a number of oil viscosity studies available to check out on you tube that should help you with an informed decision.
     
  14. Apr 2, 2022 at 6:02 PM
    #14
    ecoterragaia

    ecoterragaia [OP] New Member

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    Added the 1/2 qt. of 5w-30 shortly after @Thatbassguy 's reply.

    Put about 15 miles on it and the engine blew. I had 18 cameras on it but they were only 4K so there's no sense in uploading. I'll let you know how the rebuild goes, but one thing's for certain, the rebuilt engine will only be fed H2-01 weight oil from now on.

    Seriously, I just wanted some feedback from folks. I've only worked on older engines requiring thicker-than-water oil viscosity, and so when I see 0W-20 on the cap of my new vehicles, I start to think that it's only recommended to meet fleetwide CAFE standards. In this case I just wanted to make sure that the watery oil isn't recommended for other purposes like the oil passages for the dual VVT system or something. Doesn't sound like that's the case though, and I'm not worried about it.
     
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  15. Apr 2, 2022 at 6:21 PM
    #15
    ecoterragaia

    ecoterragaia [OP] New Member

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    I have thought about it, and would love to, but right now the 4R is still under warranty and I want to make sure records show that the recommended viscosity was used.

    Just some background, my 2006 Taco 4x4 with the 2TR-FE 4 cylinder calls for 6.1 qts of 5W-30 per oil change in the owners manual. But 3 years later the same engine model was recommended 0W-20 (and has ever since, with only dual VVT being the most obvious change in 2016). Same goes for the 1GR...the OM originally recommended 5W-30 in the Tacoma and FJ, but now requires 0W-20 since like 2009 or so. Were any changes/improvements over the years reliant on the thinner viscosity, or is it only recommended for fuel economy purposes? I guess that was my original concern when starting this thread.
     
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  16. Apr 2, 2022 at 7:39 PM
    #16
    RoadtripJim2000

    RoadtripJim2000 New Member

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    The 0W 20 water like oil was developed and recommended so fuel mileage standards could be met. I used to run 20W 50 in my 454 race car because that is what was done back in the day.... verify with your service department, but 5W 20 or 30 won’t affect your warranty coverage. It is listed in your owners manual as an alternative. The combustion process in an operating engine creates contamination in the engine oil that is acidic. This is why you do not store a car without changing the oil first. Unused oil in the original container won’t go bad. Enjoy your trucks and change oil as you see fit. We are only trying to provide you with info, but ultimately it’s your decision. No hard feelings.
     
  17. Apr 2, 2022 at 7:49 PM
    #17
    McSpazatron

    McSpazatron New Member

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    You cant mix viscosities. The two weights will lead to oil curdling. That’s why your engine blew. Vvti system will have to be dismantled, and the curdles will have to be blown out with an air hose.

    edit: fyi, Im joking. Re-read my post and it sounds like Im being serious lol
     
    Last edited: Apr 2, 2022
  18. Apr 3, 2022 at 9:45 AM
    #18
    Captain Spalding

    Captain Spalding Explorer

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    STP Oil Treatment prevents curdling of mixed oils of different viscosities. C’mon, everyone knows that. Not so well known is that you can substitute a couple of tablespoons of Marvel Mystery Oil and achieve the same thing.

    Seriously, I wouldn’t be afraid to mix oil in a pinch but I wouldn’t make it a habit. And I wouldn’t try to standardize on one oil for two vehicles with different recommended viscosities. Just put in what they tell you to.
     

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