Hello all...I am searching for a replacement compressor for my 1993 S10 Blazer...it is an R12 system and I want to keep it that way...ALL compressors that I have found are prefilled with PAG oil which is not compatible with the mineral oil used in an R12 system...I have looked at Rockauto, NAPA, Autozone, Advance Auto, Orielly Auto, Ebay...NONE of these places have one pre filled with mineral oil...please advise?...contacted 4 seasons directly and they said cannot supply one...is there a source for a compressor that comes with NO oil so I can add mineral oil?