When you remove the old condenser, pour out any remaining oil into a container and measure the amount of oil that remain. Add the same amount of oil to the new condenser and maybe .5 to 1 oz of additional oil.

As for the type of PAG to use, don't know, but a internet search should be able to tell you. Just Google BMW AC oil. I'm sure all BMW from the same year used the same type of oil.

There should be a drier in the system and anytime the system is open to the atmosphere such as changing out a part the drier should be replaced.

No it's not rocket science, but if you don't know anything about how the system work and the proper way to recharge a system, opening the wrong valve during the charging process can cause the refrigerant can to explode. In addition to the vacuum pump, you will need a very accurate scale to determine how much refrigerant is being added to the system.

__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD