Hello; I stumbled upon 2 videos of engines assembly. One is an small factory with persons instead of robots in the lines; working with small 70cc engines (bikes); the other is the modern BMW
plant, with many robots and not so many persons in the assembly lines working on big and racing engines.
In both cases the assembly is done with oil; not with assembly lube and not "dry"
In the case of the 70cc the guy put oil on top of the piston (and rings) and then put over the cylinder- With the BMW
he uses oil on the jugs of a 1000RR then insert the rod with the pistons and rings...The video mentions that they use the same oil as the engine will have due to homogeneity
I understand that with these modern engines the honing is done with finer grits and the rings may be are chromed, but for sure are not like the old Brits with iron rings; however, may be the small 70cc use iron rings; I do not know but both engines have different goals and both have oil on the jugs...
-By the way; no threads locker in the rods bolts with the 1000RR or the 70cc in the other factory. No stretch gauges for the rods bolts too.