How often should I "really" change the oil?

Discussion in 'Prius c Main Forum' started by arcarter, Feb 7, 2020.

  1. roadrunner

    roadrunner His (blue) and hers (black).

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    I suggest that you get an oil analysis from Blackstone Labs. I did it on both of our Prius c's. Go 10,000 miles and mail a sample off to them.
    They give you a very detailed report on your oil. Just a suggestion.
     
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  2. edthefox5

    edthefox5 Senior Member

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    They don't give you the TAN though. Total Acid Number which is really important if you only change the oil once a year.

    I think you have to pay extra for that on Blackstone. But I would be more concerned with the trans fluid.

    Why don't you post that UOA on the Prius C stickies. I have a few trans UOA's on the G2 site.
     
  3. jzchen

    jzchen Senior Member

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    Ed, chemically there will be no TAN if there is still a positive TBN remaining. The base is there to neutralize any acid. If it shifts to acidic I'm sure that you've gone too long/far, and Blackstone will tell you....

    Posted via the PriusChat mobile app.
     
  4. edthefox5

    edthefox5 Senior Member

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    Its a quantifying number and will tell you how much neutralization is left. I would like to see that number. If you look at my trans stickies the TBN is still ok but TAN is creeping up.

    But whatever.
     
  5. WilDavis

    WilDavis Senior Member

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    In every car I've owned¹ since I started driving (late 1960s) I've always followed the manufactures' recommendation, but remember (IMNSHO) it's more important to change the oil-filter than the oil (…but as they say YMMV). :rolleyes:;)

    ¹ Vauxhall Victor, Mini-Cooper, Bond Bug, Austin Champ, Volkswagen Golf, Toyota Tercel 4WD, Toyota Corolla DX Wagon, Toyota Prius Gen II (Touring) …er, that's it! :)
     
  6. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Sounds like you came across the pond about halfway through that list. ;)
     
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  7. WilDavis

    WilDavis Senior Member

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    …well spotted, the red VW Golf was my first set of wheels on this side of t'Pond! ;)
     
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  8. tonynap

    tonynap Member

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    On my model, the maintenance schedule calls for 10,000 mile intervals and 0W-20, but I choose to change it every 5,000 miles.

    If I was to change my thinking I would absolutely send a sample out after 5k and see how it came back, before I made the change.
     
  9. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    One thing that hasn't got much mention: these intervals are always miles or months, whichever comes first.

    That maybe falls apart with a car that's near-mothballed, but just sayin'.
     
  10. Lukey51

    Lukey51 Junior Member

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    This is what I'm going to run in my Prius in about 6 months when I do my first oil / filter change.

    [​IMG]
     
  11. frankenfrank

    frankenfrank New Member

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    In Europe Toyota calls for an Oil-Change every 15.000km, which should be 9000miles.
    If you take into account, that very short Trips are also covered as well as "urgent Drivers" which do 100mph frequently, 10.000miles on the Oil the US should be on the safe side.

    Oil analysis often show Oil starts breaking down after 20.000km / 12.500miles

    VW group an other European brands claim 30.000km without oil Change, but Engines look like that, after 100.000 miles. So that's no recommendation.
     
  12. rioe

    rioe Junior Member

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    I have done oil change every 10K since the start, now at 120K Miles. Nothing else (No fluid changes, no maintenance, absolutely nothing) has been done to the car other than 4 new tires at 80K. Runs great, no issues.
     
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