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  1. Join Date
    Oct 2002
    Mga Sirs,

    How long is the longest possible oil change interval (beyond 5,000 kms) acceptable for diesel engines using a good mineral diesel engine oil to save on maintenance costs? Nagtanong kasi ako sa may mga bus fleets at every 15,000 kms daw oil change nila using a good mineral oil (Shell Rimula X, Delo Gold Multigrade, etc...).

    Thanks. :confused:

  2. Join Date
    Sep 2003

    kuripot lang mga bus companies kaya every 15T ang palit hehe..

    pwede naman up to 10T kms ang palit ng diesel oil, kaso mas more na ang wear and tear ng engine...

    nakalagay din sa car manual kung kelan tamang palit ng oil depende sa driving habits/style ninyo..

    i would suggest na at least every 5T km or 3 months palit ng oil (ordinary mineral oil) para laging nasa top condition yung engine...

    for me, hindi ko titipirin ang mga engine parts/fluids.. sa mga body parts/accessories na lang ako magtitipid... opinion ko lang po ito...

  3. Join Date
    Oct 2002
    ako sa rev-x all terrain every 10t kms. (kia carnival) 2.9)

  4. Join Date
    Oct 2002
    I'd still feel safer with 5K and regular mineral oil because of our harsh driving conditions (stop and go traffic, humidity, rains, dust, etc).

    Its always brought up in different threads and one of the reasons i state is the build-up of sludge that i've seen on cars that have extended their drain intervals (even with synth oil).

    If you're in the province and log long steady drives on the highways, then extended drains would be more viable.

  5. Join Date
    Oct 2002
    10K is a bit too much for a mineral oil. I wouldn't even try it with synthetics.

    Yup, nagtitipid lang ang bus companies. Just look at the smoke their buses spew out on our air every single day.
    Need an Ambulance? We sell Zic Brand Oils and Lubricants. Please PM me.

  6. Join Date
    Oct 2002
    Alam ko max na yung 5k for pure minerals. If i were to guess, 6k would be the max max. hehe

  7. Join Date
    Dec 2002
    Think it's possible to extend oil drain intervals if certain conditions are met:

    1) Large oil sump using 10 or more liters which means more oil to absorb the soot.
    2) Oil filter system in use has both a full flow and a bypass filter. The bypass is a finer filter which keeps the oil clean longer.
    3) Air filters are changed more often to keep pollutants from adding dust in oil.

  8. Join Date
    Oct 2002
    how about fully synthetic oils like rev-x all terrain? advisable ba every 10t kms ang oil change?

  9. Join Date
    Dec 2002

    Think 10k km on full synth oil is ok if you change oil filter every 5k km and use the orig filter. Change air filter every 10k km.

  10. Join Date
    Mar 2003
    How about changing oil every 7000 kms. using Mobil Delvac 1 synthetic oil? Ok lang kaya ito?

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Extended Oil Drains for Diesels.....