I have the same issue with my C4S. My oil consumption has been tad high recently but it does seem to be a common nature for these M96/97 engines.
I run Mobil Super 3000 5W40, thinking to change to Millers ND 10W50.
However, I was cleaning my TB and noticed fresh oil in the Plenum... possibly my AOS is begging to fail. Not getting any smoke, high vacuum pressure, or loss in power etc. I do have a little squeak, again I have heard this could be AOS related. Note, I have replaced my belt and idler/tensioner bearings.
With regards to RMS/IMS sweat, I wouldn't worry about it, unless its dripping at an alarming rate on your garage floor
I run Mobil Super 3000 5W40, thinking to change to Millers ND 10W50.
However, I was cleaning my TB and noticed fresh oil in the Plenum... possibly my AOS is begging to fail. Not getting any smoke, high vacuum pressure, or loss in power etc. I do have a little squeak, again I have heard this could be AOS related. Note, I have replaced my belt and idler/tensioner bearings.
With regards to RMS/IMS sweat, I wouldn't worry about it, unless its dripping at an alarming rate on your garage floor