Larry,

I agree with your comments about when to use PAG and ester oil. However, I have read that some components such as compressors and condensers cannot be flushed and must be replaced. This added expense leaves some searching for a safer conversion. I beleve some do exist, and AutoFreeze may be one of them. I'm not a big fan of propane based system. Always replace the drier when the system is opened to the environment.

Regards,

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Brian Toscano