The thing is, the test only shows Mineral oil, not even PAG.

R134 wasn't shown either, and would have failed badly with their mineral oil only test as well, since it requires POE (polyolester) or PAG (polyalkylene glycol) oil to be miscible.

To me, this appears to be a test chosen carefully to show that their product is "the" drop in substitute for R-12 with mineral oil, but without mentioning the troubles of partial blend leakage issues.


For any system that has been flushed and switched to one of the other oils, or started with one of them to begin with, you'd have different results.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...