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THREAD HIJACKERS, the issue is what additives or lack thereof, composition etc, make refrigerant oil what it is. Thank you, TomNJ

AND there goes the thread. not the point. I'm not even using in an automotive application. Its R290 and used commercially in refrigeration systems factory without incident. I'll be flushing the POE out completely along with all future propane related comments.

FFS

sorry i disassembled it for parts, but basically a 3/4" NPT pipe with reducers at each end to fit gauge hoses.

Obviously, but why. Blind me with science.

I rigged up a section of 3/4 pipe with reducers to 1/4 flare on either side as a sort of accumulator to flash off liquid going in.

It was also a variable displacement compressor system, so I suspect that had something to do with it. Hard to charge by feel.

The most efficient refrigerant seems to depend on application. Boiling point seems to be related to metering device sizing, so those with close boiling points seem to work best in retrofitting. A longer capilary tube/smaller orifice seems to mean lower boiling point temperature. Straight...

From my understanding old R22/12 equipment used Mineral, which seems to mean non synthetic base 3 or less or Alkylbenzene base. New R410a equipment seems to be POE in hvac and PAG in 134a/automotive, with R1234 using POE sometimes.... Apparently they don't mix well with non chlorine based...

From my own experiments, pure propane doesn't work, 152a (Canned Air) did in numerous different vehicles. I suspect "12a" R134a replacements are blend of propane R290 and Butane (R600) to simulate the curve of 134a proper.

Nope. Baldwin. Same plant. Same stampings on batch codes etc. Regarding Donaldson, also made by FluiTek.

Lol, look at how the letters/numbers don't even line up on a legit one. Did I mention they make filters for Cat? lol

Baldwin also manufacture filters for Caterpillar, One of the few brands carried by (acklands) Grainger. FRAM and Purolator filters are both manufactured by Fluitek (http://fluitek.com/brands)