WARNING: This page is about a different car, the 2008 BMW 750i, 2007 BMW 750i, and 2006 BMW 750i. However, it is still accessible from the selected car via links, so may be relevant.
A/C SYSTEM, REFRIGERANT AMOUNTS E65 TECHNICAL DATA
Refrigerant filling quantity R134a The data on the nameplate in the engine compartment are definitive