Friends:
I am replacing the compressor, dryer and both switches, and an expansion valve and converting to 134A on my 1980 240 D.

I have a friend with the necessary tools and expertise, but no specific experience with this car. Would someone please tell me:
1. How much oil--and of which type--I need to add to a new R-4 compressor?
2. Aprox how many lbs. of R-134A should I add to this system.

Any other advice you would care to offer would be greatly appreciated. Thanks.