NAPA sells a kit for less than $50 that has a conditioner in the kit that eliminates need to replace o-rings or oil. Just bleed old systemvacuum and add included fittings, 134A and conditioner. Put it in my buick 3 months ago and holding up fine. Don't like the way the 134a performs at idle but I hear thats normal for 134A.

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65 190d sold
85 380SE sold
87 560 SL 180K
84 380SE 96K (mint)