Best oil for gen 2 Prius

Discussion in 'Gen 2 Prius Main Forum' started by ruidboi, Mar 1, 2018.

  1. ruidboi

    ruidboi Junior Member

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    Hello my car is almost to 180K miles. I currently use Mobil 1 0w20 synthetic oil in my car but the oil disappears after 4000 miles or so. Is there another type of oil I can use that will be good?


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  2. MilkyWay

    MilkyWay Active Member

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    5W30 is what it says on the cap (in the US). I use Mobil 1 5W30
     
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  3. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

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    Yeah for sure get back to 5W30. When you say "disappear" after 4000 miles, do you mean the dipstick is bare? That would be 1.5~2.5 liters low.

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  4. Fredsimm

    Fredsimm Active Member

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    I use Mobil 1 also. Seems to work best for me. I suggest that you check and add more frequently.
     
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  5. edthefox5

    edthefox5 Senior Member

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    Go up weight to 10-40 M1. That will slow down the oil loss.

    How many times has the dash logged a red triangle?
     
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  6. Rph74

    Rph74 Active Member

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    I have used the Wal Mart 5W-30 Synthetic oil for the last almost 100k on mine. 186k and all still is good. The oil stays very clean looking for the 5,000 miles I leave it in there. That being said, all of my Toyotas have been this way as well.
     
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  7. ruidboi

    ruidboi Junior Member

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    Yes I mean dipstick is bare. The reason I think to check the dipstick is that I get a quick flash of the red triangle every so often when I drive. It flashes so quickly that I often missed what it means until I saw the oil symbol in the middle. So 5w30 I will move back to. What brand is best Castrol, Mobil 1, Mobil 1 high mileage, valvoline?


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  8. ruidboi

    ruidboi Junior Member

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    I’ve seen the red triangle flash 3 separate times.


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  9. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

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    Note how much top up it takes to get it back to the top mark, and the mileage, and you'll then have an good idea of your consumption per mileage.

    I wouldn't think any particular oil is going to save the engine, from the sounds of it your consumption is high enough that you'll need to swap engine, or throw in the towel and sell it, maybe to a restorer or parter.

    FWIW I use Toyota oil since incept, with our 2010, it's good, and very cheap for me.
     
  10. edthefox5

    edthefox5 Senior Member

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    Given the fact that that you don't check the oil till the engine has no oil pressure and throws master caution usually means on this site the engine is toast. In fact sometimes one good triangle event is enough to damage the wrist pin on the piston and or main bearing. At the very least it ruins the oil scavenge ring and then it becomes a OEM.

    Oil Eating Monster.

    If damage has occurred other than oil ring you'll know as you will hear engine knock first under load then all the time then boom, hiss, smoke.
     
    #10 edthefox5, Mar 2, 2018
    Last edited: Mar 2, 2018
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  11. ruidboi

    ruidboi Junior Member

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    Never my Prius is almost to 200k and running great. It’s going to carry me to 300k. I had a car with the symptoms you described before. The oil light came on once. I put in oil. Then a day later boom engine knock. Which is why I was so freaked out by the oil light. I didn’t experience this oil disappearing until I switched to Mobil 1 0w20 so I thought it was the brand or the type. If oil empties after 4K miles is that considered an oil eating monster? If so then I shall change every 3000 miles


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  12. wjtracy

    wjtracy Senior Member

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    I'd heavy up that oil. Mobil-1 High Milage 5W-30 is one option, or the 0W-40 is good sounds like.
    You gotta get out of 0W-20 on a Gen2 if you have oil losses, it was never the recommended flavor in the USA, although Toyota USA said it was OK in one owner communication shared with us years ago. I believe engine/piston tolerances were tightened up after Gen2, so it's a bit older technology than Gen3+
     
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  13. edthefox5

    edthefox5 Senior Member

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    What does “never” mean?
     
  14. uart

    uart Senior Member

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    You might have been lucky and dodged a bullet, but I wouldn't assume that everything will just be "back to normal" once you get 5w30 back in there. You may well have permanently increased oil consumption now, so you need to check it fairly regularly (every 1k to 2k miles at least).

    With a 200k mile Prius you need to check the oil reasonably often anyway. If you had previously been checking the oil (prior to switching to M1 0w20) you probably would have notice significant oil consumption anyway (just not enough to take it all the way down to sucking air in under one oil change interval). That would have been the warning that you needed to keep an eye on it, especially when changing to a thinner oil.

    Also, eating oil doesn't mean that you need a shorter oil change interval, it just means that you need to check it more regularly and keep it topped off.

    TBH 0w20 was a really bad choice for a 200k mile Prius in winterless tropical climate like The Bahamas.
     
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  15. jerrymildred

    jerrymildred Senior Member

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    Cars really should have an "oil level" light. If you lose pressure, that means you're not getting oil to the bearing surfaces and you might have one second at most (depending on rpm and load) before you damage the engine.

    As said above, use heavier oil and hope there isn't significant damage. Oh. And check the oil every time you get gas. That used to be standard procedure for all cars. They are so reliable now, that we forget.
     
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  16. uart

    uart Senior Member

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    Some modern cars do have an oil level warning (in addition to an oil pressure warning). I know that some VW/Audi do, and also some BMWs. The only problem is that once they include this feature they often remove dipstick completely, and then it becomes a nuisance to top off without overfilling. I know that my brother had to get an aftermarket dip stick fitted to his Audi because it didn't come with one from new!

    Still you're right. As this thread (and many others like it) illustrate, for many people checking a dipstick seems to be an incredibly onerous task. Why that is I'm not exactly sure, but I suppose it's something to do with having to pop the hood and being exposed to a part of the car (the engine bay) of which they have little knowledge and feel uncomfortable touching.
     
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  17. edthefox5

    edthefox5 Senior Member

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    Its amazing. How costly and stupid it is to ignore all the fluids under the hood. Takes 30 seconds from seat to seat. This poster is unique. He's using the NO OIL PRESSURE light to remind him to check the oil lol. I guess it's a testament to how tough this car is.
     
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  18. ruidboi

    ruidboi Junior Member

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    Makes sense. I’ve heard before that climate has an affect on the oil you should choose but I never learned what oil is best for my climate. So 5w30 m1 for winter less climate or something else?


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  19. ruidboi

    ruidboi Junior Member

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    Like the other poster said I just assumed that when oil reaches low the light would come on and give me ample time to stop and get some. That would be the common sense way to design the vehicle. But I was wrong. What good is an oil warning light if by the time you see it it’s too late? I’m gonna check that dipstick every fill up for now on.


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  20. jerrymildred

    jerrymildred Senior Member

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    The oil pressure light is, unfortunately, like the tornado warnings used to be in the 1960's when i was a kid. If you heard the siren, that meant you or someone nearby just got clobbered. :(

    My car uses and loses no oil at all, But I still checked is yesterday when I got gas.

    @uart, I didn't know that about some high end models having oil level lights but not dipsticks. That would be maddening for me to not know if the low level light was just about to come on as I hit the road for a 5,000 mile trip.
     
    #20 jerrymildred, Mar 4, 2018
    Last edited: Mar 4, 2018
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