Question about Chevrolet Caprice

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In automotive a.c. when do i use pag oil and when do i use ester oil

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  • loustoy235 Sep 11, 2010

    Two lines were replaced because of leaks. The old lines driped oil,thefore i guess some oil needs to be replaced.

  • loustoy235 Sep 11, 2010

    It is a 1999 chevrolet 5.8 l engine.

  • loustoy235 Sep 12, 2010

    Thank You



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Kindly provide the make and model of the car?

Kindly explain the problem in detail? Why you wanted to add pag oil?


Posted on Sep 11, 2010

  • taran_2005
    taran_2005 Sep 11, 2010

    Thanks for your response!!

    You still haven't provided the year, make, model and engine of the car.


  • taran_2005
    taran_2005 Sep 11, 2010

    Thanks for your response!!

    The whole system takes about 11 oz. or 325 ml. If you are just changing
    the compressor add 4-6 oz to that. Turn the shaft to **** the oil in. I
    would also change the accumulator, add ~2oz in there. If you flush the
    evap and/or condenser, also add ~2oz to each. The idea is to evenly
    distribute the oil throughout the system - don't try to add all the oil
    for a dry system into one place or the compressor will fail. Check with
    the compressor manufacturer which viscosity of PAG to use - 46, 100 or

    While both lubricants are
    used with R-134a, Ester is believed to be better for
    Retrofit systems because they are much less hygroscopic,
    which means that they don't absorb as much water from the
    atmosphere as PAG Oils do. This moisture can create
    problems in a vehicle's A/C system. Ester is also a truly
    Universal lubricant which has a Single Viscosity. PAG Oils come in
    a variety of viscosities which must be matched to the vehicle.
    GM vehicles use a high viscosity (150) PAG Oil, and non-GM
    vehicles use a low viscosity (46) PAG Oil. You cannot use a
    100 viscosity PAG Oil as a "1 size fits all" universal
    lubricant. Ester Oil, however, is truly universal and will
    lubricate properly regardless of viscosity.

    Let me know,if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!



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