Ok, in my opinion, you need a new dryer. It holds 3 oz oil, the expansion valve likely leaked out 2 oz oil. Compressed air has soaked your dryer desiccant, so it HAS to be replaced.
The air likely won’t make much more issue than that, IF you have repaired the leak verified for 24Hours under pressure with CO2 or dry N2. CO2 is easy to get at any Walmart or sporting goods store.
Really... it is worth it to get some, so you can change the dryer and know the system is dry after the vacuuming.

Yes, helium will work great, but it’ll find leaks R12 won’t leak out of. Nitrogen is the best... but not everyone can afford to get it. Any HVAC truck will have it in stock... maybe bum some from a tech?


How long do you want to keep the car? With moisture in the system, the oil will become acidic and DESTROY the impossible to replace evaporator coil...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!