Converted system to R134 (not that cold)

[Rev]

I've heard that you have to drain every last drop of the old oil out of the compressor. Like over night with the compressor upside down and dripping. Then a complete new R134A charge with a new oil charge. I heard this from an AC guy, but he was a house AC guy. I've never done this and so this is second hand info.

Rev

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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.