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Oil Change: switching between oil types bad?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by JT-KGY, May 21, 2008.

  1. JT-KGY

    JT-KGY Junior Member

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    I'm about to do maintenance myself on a new Prius with 5000 miles.
    After searching through this forum... I've found lots of very helpful info
    and write-ups...

    I didn't find anyone mention if switching oil type say...
    OEM regular => Synthetic => OEM regular
    will be bad for the engine...

    Just in case, if one day I'm too lazy to do oil change myself :)
     
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    No problem. However you can furnish your synthetic oil to the oil change place and request them to use that oil.
     
  3. VaPrius

    VaPrius New Member

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    I do the maint. myself as well, but I stick with synthetic. Switching shouldn't be an issue. Patrick is right, the oil change/dealership shops are just glad you came in. If you bring the oil, they'll put whatever you want in. I've had several offer.
     
  4. JT-KGY

    JT-KGY Junior Member

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    Got it thanks guys..
     
  5. DaveLadely

    DaveLadely Junior Member

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    Yes, use synthetic. Switching won't cause problems, but why do it? I waited until about 6k miles to use synthetic due to break-in of gas engine due to gas engine not running as much as non-hybrid. I used Mobile 1 extended, noticed better mileage right away. Went from about 52mpg to 55.o mpg last tankfull, and that was in the Seattle area, which is hill and dale a lot, both city and freeway. I also used best oil filter available. I am waiting for Amsoil to bring out a filter for the Prius that uses their new filter material, better than K&N, etc.
     
  6. JT-KGY

    JT-KGY Junior Member

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    Cool!! If I were to go with Synthetic.. it would be Amsoil.
    I run Amsoil exclusively on my other car too.

    Which Amsoil would you recommend? I'm thinking the XL-5w30 but how
    about the 0w20? 0w20 is probably ok due the light load nature of the
    hybrid engine.
     
  7. DaveLadely

    DaveLadely Junior Member

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    Yeah, used 5-20 I think. I think 5-30 or 10-30 is factory recommended for non synthetic oil, but since synthetic oil has significantly better film strength and slipperyness, I figure the 20 weight is fine. Also, it is in a light duty application, as you mention. Oil should be the least viscosity while maintaining film strength because it is very important for the oil to start flowing through the engine quickly upon starting and 20 weight will flow quicker than 30 weight. I think Amsoil is very good. I am not a fan of their oil filters, though, espcially after seeing test results. I prefer Mbile 1 or K&N, which peformed well in actually tests.
     
  8. JT-KGY

    JT-KGY Junior Member

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    Few more questions..

    Is this the correct way to reset the "Maint Req" light?

    With the power on, switch to the odometer to display "ODO".
    Power OFF (push the "Power" button).
    Power ON, while holding the button for "ODO".
    Hold until the reminder light stop flashing, then release.
    ?

    Also, whats the official recommended oil spec by toyota?
    Just any 5w30?