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Re: What year?
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Posted by JerseySaab [Email] (#666) [Profile/Gallery] (more from JerseySaab) on Thu, 20 Jun 2013 14:15:46 Share Post by Email
In Reply to: Re: What year?, steve, Thu, 20 Jun 2013 13:32:17
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I'm not familiar with the ND-8 and SP-10 designations, normally I use the oil specified by the compressor manufacturer which usually is PAG oil of either ISO-46 or ISO-100 viscosity. Some cars may use ISO-150 viscosity but none that I've dealt with. I think POE oil is normally used in stationary refrigeration and AC equipment, not cars. I don't know whether it mixes OK with PAG or not. (I'm not a professional AC tech, but I learned from a friend who was one for over 40 years.)

The worst thing about PAG oil is that it is basically a sponge that sucks up moisture from the air, and it does not release the moisture under vacuum. When you're putting together an AC system you want to add the PAG oil last, just before applying vacuum, to minimize moisture absorption. Remember, moisture in R134a systems forms acids that eat holes in your evaporator and condenser! I always use a fresh, sealed bottle of oil and discard whatever is left over. PAG oil is readily available at real auto parts stores or online. Brand probably doesn't matter, I've been using FJC. Also, I use Nylog for assembling/sealing O-rings and fittings.

The only way I know of to get all the oil out of the system is to use a flushing kit. You can't flush the compressor or drier, so you would need to change the drier and physically dump the old oil out of the compressor.

I found one forum that suggests POE oil is the better choice for modern refrigerants but for "reasons unknown" PAG was chosen by manufacturers as the standard for automotive AC.

Mineral, AB, POE, PAG. When to use what oil?

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