It was intended for everyone. There is an amount of oil that is just sufficient to keep oil moving through the engine. Let's say the sump needs to have half a liter just to keep the pickup submerged so the oil pump can draw. And let's say that filling all of the galleries and cavities takes another quarter liter and that there is another quarter liter on its way back to the sump.
In total, one liter.
Any less than that and the oil pressure is going to be intermittent as the pump starves until enough oil refills the sump above the half liter level, then it pumps the sump below a half liter and starves itself again. Rinse, lather, repeat.
The engine is on the verge of oil failure.
The question was meant to spark conversation along those lines.
As I said in my last post, we know that being a half liter low won't hurt anything. @Daniel Kavcak
is bringing an abused 1993 KLR back to life and said that he drained only a quart and a half out of it, but he didn't report any head damage.
I wondered what people's thoughts were on how much oil was in circulation (in motion above the sump) at any one time. I can get a set of cases out and measure pretty close how much oil needs to be in the sump to just submerge the pickup.