Aargh!! Don't mix refrigerants, it'll cause contaminated recovery units/tanks, premature follicular degeneration, men and women living together, the end of life as we know it!!! (plus it gets the EPA all excited)

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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K