E24, E28 produced prior to 9/87
Pentosin CHF 4548 was used for initial factory filling.
For filling up and replacement the following oil is to be used:
Pentosin CHF 7.1 BMW Part No. 81 22 1 468 879
Pentosin CHF 4548 and CHF 7.1 can be mixed in these cars.
For complete system oil replacement:
Reputable brand name LHM oils (green color) can also be used (Shell, Castrol, Exxon, etc.)
NOTE:
Mixing of CHF and LHM oils is not permitted.