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Any thoughts on first oil change interval?

Discussion in 'Gen 5 Prius Care, Maintenance and Troubleshooting' started by Hammersmith, Jun 14, 2023.

  1. Hammersmith

    Hammersmith Senior Member

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    I'm going to do 6 month/5000 mile oil changes for as long as I own the car, but what about the very first oil change? The manual doesn't say anything about an initial early oil change, but I've heard it's a good idea to get one at 500, 1000, or 1500 miles. Just because the internal moving parts are more likely to generate debris during the break in period than they are at any other time except engine failure.

    I'm coming up on 500 miles, and I'm trying to decide whether to do it now or wait until 1000.

    Thoughts?
     
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  2. MalachyNG

    MalachyNG Active Member

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    Personal preference.

    Toyota Care won't change the oil until 10,000 miles.

    I've followed the manual with all of my Toyotas with to no ill effect.
     
  3. sam spade 2

    sam spade 2 Senior Member

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    What a waste of perfectly good oil.
    I suggest your first change at something like 3-5000 and then every 7 to 8 after that.
    Not because the interval needs to be that short but just to make you feel better.

    That way, you can fudge the mileage to rotate the tires and have it all done at the same time.

    With modern fully synthetic oils, there is really NO good reason to short the recommended
    intervals......especially not the time part.
    Once a year is PLENTY if you don't exceed 10K miles.
    Really it IS.
     
  4. Ronnie5

    Ronnie5 Member

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    I did my initial break-in oil change at just over 1000 miles. I’ll do the next at 5000 and then every 5000 miles after that. I do my own oil changes and sleep better knowing I don’t go 10000 miles between changes.
     
  5. MaxT

    MaxT Junior Member

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    I do my first at 1500 and then at 5000 and every 5000 after that.
    Cheap insurance in my mind.
     
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  6. ColoradoBoo

    ColoradoBoo Senior Member

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    I, also, do an initial oil change on new vehicles around 1,000 miles. Then every 5,000 miles or 6-months, whichever comes first.
     
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  7. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    Do what you feel like. These aren't 1940s cars. They're ready for 10k right out of the gate.

    ...but if it makes you feel better, overmaintenance won't hurt the car.
     
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  8. sam spade 2

    sam spade 2 Senior Member

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    So the hundreds (maybe thousands) of dollars that you are WASTING over the life of the car doesn't give
    you nightmares ? If not, maybe it should.
     
  9. ColoradoBoo

    ColoradoBoo Senior Member

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    If someone changes their oil every month, what's that to you? It's their car and their money....more power to them! Folks who want to save money, and are able, learn to do their own maintenance....it's a win/win situtation.

    The only maintenance item I've ever heard of that can actually do harm is to change the transmission fluid too much because of the nature of it actually needing friction to help the gears and such.
     
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  10. Ronnie5

    Ronnie5 Member

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    Oil change cost me about $35. At 5000 mile intervals I'm spending an extra $35 a year compared to the guy who changes every 10000 miles. Walmart sells Mobil 1 for about $28 a jug, and I get oil filters from Toyota for about $6. I'm good with an extra $3 a month in maintenance.
     
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  11. samsprius1

    samsprius1 Active Member

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    Clean oil never hurt an engine! I think 10K is stretching it a little bit! I am the same do my own oil changes w/factory filters, and oil! That sounds like a good plan, I’ll do the the 10 K and 20 K at the dealer!
     
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  12. PhoS

    PhoS Active Member

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    Modern Toyota engines have insanely tight tolerances I really doubt you're gonna find any metal in the filter on these engines from break in unless there was some catastrophic issue present. The additives in good oils are not breaking down at 5k but none the less I will take a sample to get analyzed then and go from there.
     
  13. douglasjre

    douglasjre Senior Member

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    Oil samples always say u can go longer but the samples never seem to show how many particulates and what size are in the oil
     
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  14. ETC(SS)

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

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    +1

    The MORE times you open the hood and crawl under the vehicle the greater the chances that you will detect problems in their early stages.

    Good Luck!
     
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  15. sam spade 2

    sam spade 2 Senior Member

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    The other side of that coin:

    Changing the oil twice as often as it needs to be.......means that there are twice as
    many chances to screw something up in the process.

    Then.....when the maker of the vehicle AND the maker of the oil both agree on a recommendation,
    what exactly qualifies you to disagree with that ??

    Serious question. Not really trying to start a fight.
     
  16. ETC(SS)

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

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    The name on the title.
    Also a more careful check of the warranty and maintenance guide, which for the OP is found.....
    https://assets.sia.toyota.com/publications/23Prius.pdf.
    In some places and under some conditions 10K Oil Change Intervals are not advisable in the schedule of maintenance and the engine oil manufacturer has no idea what vehicle the oil is used for nor under what circumstances.
    My newer GMC has an OLMS that's based on a 7500 mile OCI but uses the same oil (0 dubbaya 20) that used to be in vogue for G4's - I think, which used a 10,000 mile OCI (sans OLMS.)

    Granted,
    On ANY new car, its new engine has the same type of oil filter as an older one, and the idea that there are pounds of metal shavings cruising around in your lubrication system isn't very plausible.
    Especially after 100 miles unless your oil filtration device REALLY SUCKS.
    However (comma!!) replacing the oil at 1000 miles isn't completely insane if only to serve as a training aid on a new vehicle that you're familiarizing yourself with in order that you might do the same thing 50 more times over the next 15 years and/or quarter million miles.

    Most of the people that get into the oil-wars wind up keeping their vehicles for less than 5 years.
    If that's the case then does it really matter at all?


    Your car.
    Your call.
     
    #16 ETC(SS), Jun 16, 2023
    Last edited: Jun 16, 2023
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  17. sam spade 2

    sam spade 2 Senior Member

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    Your name on the title qualifies you to do whatever you please with your vehicle.

    It does NOT, however, indicate that you somehow know more than the people who designed and build it.

    And yes, many of the discussions that take place in forums like this don't really matter at all when
    you get right down to it.
     
  18. ETC(SS)

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

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  19. Hammersmith

    Hammersmith Senior Member

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    I care less about the people who designed and built it, and more about the experts that maintain and service these engines and what they've seen what they look like after 100k/200k/300k and after a lifetime of 1y/10k vs. 6m/5k, and what they find the failure points to be. And one of the most common points of failure after 100k is down to sludge buildup in critical places.

    Doesn't matter how good the oil is, engine heat will eventually break down some of the long hydrocarbons in sludge-producing, shorter hydrocarbons. The longer those shorter hydrocarbons sit in your engine(especially if the engine isn't running), the more they can build up into sludge deposits. Changing the oil more frequently means a smaller proportion of damaged hydrocarbons in the total oil, less time for damaged hydrocarbons to settle, and an overall stronger mix of detergents to break any sludge deposits down.



    Toyota considers the life of a vehicle to be around 150k miles. 1y/10k changes will almost certainly get you to 150k. But they might not get you to 175k. 6m/5k changes will likely get you to 250k or even far more. Since I plan to hold onto my new Prius for 10-15 years(I had my last one for 13), I'm very interested in what happens after 125k and into 200k.
     
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  20. Hammersmith

    Hammersmith Senior Member

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    Chunks or pounds of metal? No.

    Extra tiny, tiny(microscopic) bits of metal in the first 500-1000 miles compared to later? Yes.

    It's not about manufacturing flaws, it's about initial break-in wear. While all the metal parts that contact each other in the engine might appear smooth to the eye and to the touch, there will always be tiny irregularities at the microscopic level. These irregularities get worn off in the first 500-1000 miles as the metal parts mate to each other for the first time, producing a little extra debris that gets carried around in the oil. This debris can't harm the engine directly or quickly, but it can reduce the long-term life of the engine by getting embedded into things like internal seals. Over 10+ years and 150k+ miles, this can cause premature seal failure or create slightly rough points where oil sludge can begin to settle and build up. An early oil change can get rid of the bulk of this microscopic extra debris before it embedded or stuck somewhere in the engine.

    Does this microscopic wear continue through the life of the engine? Of course. But there's still a surge of it during the first several hundred miles that won't be repeated unless you do major engine work at some point with a bunch of new parts.
     
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