well, as there was some leak, today i removed the cover. the liquid gasket some1 used was very well attached and had to struggle to remove it. still, was leaking. perhaps the material used was not the most suitable. anyway, removed all the stuff. all the surfaces were completely free of the gasket and oil. cleaned with toluol. added black permatex, enough to fill the grooves but not too much. reinstalled the cover and tightened to torque as per instructions.
allowed to dry several hours before starting it or driving, despite the instructions saying is instant. just to be sure. will see in a week or 2 how it works. and will check the torque too.
thanks all who have provided so much data.
this is 1 thing that, even if not vital, is something that just has to be done. and is very common. the engine (and all the other mechanical components) are of great quality and design and this great car deserves to be kept clean. is a joy to watch it.
thanks again to all you great guys.
this is what i used: