5gen PHEV break-in (first oil change) report + Oil level question

Discussion in 'Gen 5 Prius Technical Discussion' started by FRCornelis, May 26, 2025 at 3:21 PM.

  1. FRCornelis

    FRCornelis Junior Member

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    Hello all,
    Decided to do first oil change at about 1k, as I usually do with all my new cars to refresh factory fill.
    This one is 2024 Prius Prime XLE Premium I got in late January.
    Using called out: 0-W16 & 90915-YZZN1 -Toyota branded oil and filter.

    According to ALLdata and user manual specs. the oil capacity for drain w/ filter is 4.1 US QTs, which is less than my 4gen regular Prius and my 3gen, both being 1.8L motors.

    I’m happy to see that this time the replacement filter you can get at the dealership (N1) is the same size as the one that came installed from factory (Japan made) …on my 2022 gen4 the factory Japan one was a bit longer than the (again N1) made in Thailand that you can get at the dealership, so there is that.
    I also noticed the oil level from factory was a little bit above the max mark/dot both cold and operating temperature, but not concerning, very clear seen on both side of the the dip stick, which I recorded for reference.
    Also, I noticed my Harbor Freight jack I needed to purchase to clear the suspension for the 19” wheels it’s almost a perfect color match???

    SO…
    I wanted to remove as much as possible from the factory fill, so I took my time, I even lowered the car while draining to mitigate the angle, then jack it up again to finish (more oil came out)

    now… I realize the the 4.1qt is for reference only, dip stick should be used for measurement, therefore I filled with 4 + 0.20 QTs (so I added just a little bit from the fifth quarter bottle to prevent over fill) then I would top off later if needed with car leveled to the ground… Ran the engine in maintenance mode for 3 mins, checked for leaks, then put the cover back and lowered the front end.

    HERE is the thing & where I need your input…
    When checking the dipstick, between the min & max marks, level it’s a little over the middle so between the two dots (no top off oil was added after the mentioned 4.2qts)
    I left it alone overnight and rechecked this morning (cold) and level is about the same on one side of the dip stick, like: how much oil should I add to top off?

    I’m new to this 2.0L engine being a new design comparing to the old 1.8L, for those of you with the 5gen.
    -how much oil did you actually use? I don’t want to over fill it. And what makes it harder… on the other side of the dip stick it’s really inconclusive, really hard to read the level, it looks like (all wet passing the max dot, not distinctive level that I can read) so I’m not sure if I should add more oil using the side of the dip stick that shows level under the max dot.

    NOTE: uploaded photo of dip stick w/ oil level was factory fill before draining (I took for reference)

    Any help would be really appreciated.
    thank you
    -FC
     

    Attached Files:

    #1 FRCornelis, May 26, 2025 at 3:21 PM
    Last edited: May 26, 2025 at 3:40 PM
  2. Gokhan

    Gokhan Senior Member

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    You don’t need to worry about this. It is not a precise measurement. If it were, every car would be overfilled and suffer engine damage everyday.

    You get about one quart of leeway after the oil level reaches top mark on the dipstick before overfilling (oil making contact with the crankshaft, causing aeration and subsequent engine damage) occurs. So, even if you put half a quart more than the specced amount, it is perfectly fine.
     
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  3. Trollbait

    Trollbait It's a D&D thing

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    I've always aimed for in between the upper and lower marks when I do a change.
     
  4. FRCornelis

    FRCornelis Junior Member

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    Yeah…, I suppose I’m not causing any harm by leaving it in between the two marks. I was just surprised how off the specs are. I ended up adding 4.5 QTs (in total) so same as all my other Prius(es) that brought the level right by the full mark.
    So specs are off by 0.4 qts. I guess they are not kidding when the state *capacity for reference only, use dip stick.

    I will measure the oil that came out on the container, just to have a ballpark idea on the factory fill amount of oil.
     
  5. KMO

    KMO Senior Member

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    How so? I thought you said adding 4.2 (above the specced value 4.1) took you to just over the midway between min and max - just over where it should be. And then 4.5 took it to max.

    That sounds like the specs are right. The specced capacity would be how much they think you should need to fill it correctly, not the capacity to maximum.
     
  6. FRCornelis

    FRCornelis Junior Member

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    Yes, the spec’ed reference is 4.1qts, I started around that (give or take) which took me to the middle range.
    In order to get a shy below the top dot, it took 4.5 qts in total.
    Still less than the factory fill level (photo shown) so I believe I won’t cause any damage.
    But the point is, it’s more than 4.1qts for sure to bring by the top dot, assuming you do a good quality drain and not like the dealership that : drains under 45 seconds, scratches your oil pan removing the the crush blue washer, nicks your wheels when doing a tire rotation, and still overfills your crank case.
     
  7. Hammersmith

    Hammersmith Senior Member

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    I'm just a little confused. Are you trying to get the oil to the max mark when the engine is cold or when it's at full operating temperature?

    When I change my own oil, I shoot for somewhere between the 1/3 and 1/2 area above min when the engine is cold. That leaves me plenty of room for the oil to expand as it warms and still keep it below the max mark. Now if my engine had 250k miles or more and burned some oil, then I might add another half qt to a full qt to give me some extra breathing room between top-ups. But for a new, clean engine, I'm going to keep the cold oil level a little below halfway between the dots.


    I also question if the specs are as far off as you claim. The spec is for draining the oil in a standard fashion(level car) and then refilling it to about halfway between the marks. What you did was to tilt your car to get extra oil out, then you filled it up to the max line. Why is it surprising that removing more oil than normal and then filling it up further than normal ends up with requiring more oil than the specs say?
     
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  8. FRCornelis

    FRCornelis Junior Member

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    Tell me how you can avoid not tilting the car when jacking the front end or if you use ramps or jackstands? Unless you have something like a QuickJack or some sort of lift.
    I definitely let the car drain for a while (longer than the delahership would do for sure)
    Level still below of what came from factory, user manual says to fill up to the refill line (no more) but to the top dot.
    I understand leaving it half way is perfectly fine and will not hurt the engine, it was just an observation.

    No, I’m not looking to fill it to the top of the line when the oil is cold either, however I don’t think it takes 1/2 way of room on dip stick to allow expansion, for what I can see the expansion is really minimal as when checking the oil early in the morning (cold) or after a drive (10 / 15 min. thereafter) I really don’t see any remarkable difference on the level despite of temperature.

    IF I see engine level going much higher than the top dot after a full cycle drive, I would definitely adjust the level by removing some.
     
  9. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    @ "Any help would be really appreciated."
    Easy....
    Put down the shovel.

    Keep the oil between the dots and check it every other time you get gas, and stop sweating the small stuff!!!

    Really!

    You have a 250,000 mile car if you pay ANY passing attention to maintenance.
    My company (and some people in this forum!!!) managed to get LUNAR mileage out of the G3 model.....which has several MAJOR design deficiencies that have (allegedly) been mitigated in the G5......
    One of the advantages of paying the "Toyota Tax" for a supposedly "better built" car is that it 'should' operate normally if......slightly 'over-filled' from the factory.
     
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  10. FRCornelis

    FRCornelis Junior Member

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    I guess you are correct, I'm overthinking as usual, then add my OCD on top, this is the result.
    Thanks for your feedback.

    -good day.
     
  11. Mendel Leisk

    Mendel Leisk Senior Member

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    This is on our 3rd gen, so fwiw: I’ve found checking oil level fresh on the heels of an oil change, it’ll indicate low on the dipstick. First few times I’d add a bit, and rechecking a week or two later, find it overfilled. At least the first time, I’d resist the urge to do anything other than putting in the specd amount. Just give it a while.

    also, when checking the dipstick, pull and wipe it, then wait at least 5 minutes, to allow oil possibly drawn up the guide tube time to drain back down. Otherwise it can be smeared, difficult to discern true level.
     
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  12. FRCornelis

    FRCornelis Junior Member

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    Thank you Mendel, I know you would chime in any time soon.

    I'll do just that. Keep an eye on the level and if needed I it ends up going beyond the max, then I'll extract some.

    -FC
     
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  13. Mendel Leisk

    Mendel Leisk Senior Member

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    Counterpoint: my son and I are changing oil on his Mazda CX5. Specd oil qty (at refill with filter change) is 4.5 litres, which has proven way too little. We’ve settled on 5 litres, which gets it about to the middle between the two dipstick marks. Likely would need 5.5 to get to top mark. Seen internet mention of this anomaly; I’ll maybe ask Mazda service about this, next time I’m in there getting a filter.
     
    #13 Mendel Leisk, May 27, 2025 at 11:17 AM
    Last edited: May 27, 2025 at 10:25 PM
  14. FRCornelis

    FRCornelis Junior Member

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    Well, the manual and ALLdata states that listed capacities are for reference only, so there's that.
     
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  15. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    We've all been there.
     
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  16. Mr.Vanvandenburg

    Mr.Vanvandenburg Senior Member

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    Looks fine, both my 07 and first 20 came from the factory like that. I try to keep at the top dot on my second 20, bought used, but like others have a bit of a time seeing the oil level. When I put the oil in it seems very close to what the manual says. Side of bottle looking at level put in method. When in doubt go with the stick.