high123bid

I am sure Bavarian engineers don't think atf and hydraulic oil is the same. Does anybody know for a fact what the correct oil is to refill the little sealed for life reservoir on the tiny compressor in the trunk that operates the soft close, please?

Also, does the reservoir unscrew or how do you get in there. Is there a fill screw like with the SL convertible tops?

Best regards

ibeforreal

Are you talking about the soft close for the doors? The doors are controlled by a PSE pump and actuators. Are you referring to the unit that controls the trunk open/close?

high123bid

This is for the trunk. not the door. It may actually just be a hydraulic pump and a compressor per se.

ibeforreal

Are you talking about the one that sits beside the battery with the foam covering over it?

high123bid

yes. that is correct. the one by the battery.

ibeforreal

I use Pentosin CHF 11. Some people use regular ATF but the Pentosin is much better and will last longer. It comes in the green can.

cybertronicify

Same one used in your power steering pump. Also used in the ABC system.

tusabes

Proper fluid for the trunk pump is pentosin chf11