15k oil change

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Mdv55, Nov 15, 2019.

  1. Mdv55

    Mdv55 Junior Member

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    I see lots of hand wringing over oil changes so I figured I'd post my results from long intervals. This is the second 15k run I've done on this car and see no reason to change that at this point. The car does get a new filter at 7500 miles and is topped off with 1/2 quart of new oil. Analysis shows low wear metals and oil still well within spec.

    priusuoa.jpg
     
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  2. Pluggo

    Pluggo Active Member

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    How many gallons of fuel do you estimate you used for those 15,000 miles? Many cars that get only 30 mpg have a recommended oil change interval of 7,500 miles, so at least in those cases, it may be most useful to think of an oil change after 250 gallons of gasoline are burned in the engine. To a certain extent, that kind of formula would automatically shorten the oil change interval for cars that are operated under severe conditions.
     
  3. Mdv55

    Mdv55 Junior Member

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    It should have been 300 gallons give or take a few. I think other factors such as sum capacity and average temp have more to do with it then fuel usage (unless there is a dilution issue going on)
     
  4. Grit

    Grit Senior Member

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    Well the other important information was also left out on the 1st post :whistle:
     
  5. Mdv55

    Mdv55 Junior Member

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    ?
     
  6. Grit

    Grit Senior Member

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    Oil filter make/model
     
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  7. Grit

    Grit Senior Member

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    Getting close to my 2nd 15,000 mi OCI, won't stretch pass 15K mark either. I keep the same filter til oil is change- Mobil 1 20,000 mi with Redline 5w-20. The big difference is the zinc addictive; 1200 ppm. My commute is 100 mi a day, 63.8 mpg since last oil change which was 9,000 miles ago w/ICE on 95% of the time.

    You dump any fuel or injector cleaners in the gas tank in between oil changes?
     
  8. Mdv55

    Mdv55 Junior Member

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    I'm using the OEM Toyota filters. I jack the car up every 7500 for a tire rotation and general look over so it's easy enough to just swap it out. I felt better about the new 1/2 quart of oil giving everything a TBN boost, but that seems unnecessarily given these results.

    The car sees 100-300 miles per day of city/surburban/highway driving. I can get high 50's surburban, low 50s city and 47ish on the highway runs at 70-75mph.

    The last two intervals haven't seen any fuel additive, but I did just dump some in last week.

    Redline is great stuff too My track car gets a steady diet of it.
     
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  9. Grit

    Grit Senior Member

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    Are you using the signature series oil?
     
  10. Mdv55

    Mdv55 Junior Member

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    Yes.
     
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