Is there any technical read up on the S65 low pressure VANOS system especially the stepper motor/actuator that is replacing the high pressure VANOS (hydraulic piston, piston bearing, helical gear) in the S85 ?
Everything I found online is for high pressurized oil VANOS which is irrelevant.
More knowledge would help categorize noise sources issues.
People have said "it's simple there is nothing to it". It does not appear that way.