Another vote for Fuchs !
The recommended grade would be Titan Sintofluid 75w-80 which meets the following BMW specifications: BMW 83 22 0 309 031, BMW 83 22 0 403 247, BMW 83 22 7 533 818,BMW 2300 1434 404, BMW 2300 7533 513, BMW 2300 7533 818. IIRC the change/refill capacity is around 2 litres...