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workshop-manuals.com lists the torque on the aluminum oil pan bolts for N52 as:
M8x26 aluminum bolts: 8 Nm then additional 90 degrees
M8x92 and M8x112 aluminum bolts: 8 Nm then additional 180 degrees
My older version of Bentley manual doesn't cover oil pan so couldn't find torque specs there.
That white locktite kind of thing on the bolts cause some drag and false clicking of my torque wrench at 8 Nm before they are really tightened at 8 Nm. When they are really tight at 8 Nm, torque wrench clicks and do stop at it, even at 2nd or subsequent attempts. But needed to be careful while torqing.
The oil return line is something for the early N52's with metal magnesium valve cover. Plastic cover (with black engine vanity cover) N52's have the oil return inside the valve cover, hence you found just a plug for it on your oil pan.
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