Why use oil? Because that's the least amount of work, since there is already oil in the old condenser. Let it drain in the hot sun, most of it will come out. Acetone and flush agent evaporates too fast, not good if you want to measure it. Water would work, but then you have to flush it afterwards- more work.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked