Even if I cleaned my old system piece by piece you will never get rid of all the remnants of the old R12 so I need the essentials Oil must be compatible with my system's conversion to R134a. Works great, PAG oil would stick to R12 and stick with it, but essential oil doesn't react with R12 and doesn't work with it. Compressor runs smoothly, just a few drops in for a new dryer and now that it's UV polluted I can check my system for leaks in the future. So far everything has worked for me without any problems, a great product for any conversion of an old system.
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