Hydraulic oil and Rough idle

[Minven Wang <mwang@stern.nyu.edu>]

Hi. I have a can of Hydraulic oli which a mechanic used put in my '86 5kcs.
But now I'm a little in duobt.  Audi manual says use Audi oil No. G 002 000
or equivalent, but this can is Pentosin CHF 7.1 and has BMW-Teile-Nr.: 81 22
9 407 549 on the side.  Can I use it?

besides, the car always have very rough idle.  Was it is stopped, the while
car seems vibrates, particularly the steering wheel.  When I step on the
gas, the car is very smooth again.  I have two mechanics checked it and could
not identify the problem.  The reont rotor and pads have been changed recently.
The front rotors and pads was changed last year.

Thanks.

Minven