Super interesting all of this!
Another point mr. Oilman might have some knowledge about:
When changing the oilfilter I always fill the oilfilter. Is this actually important? It doesnt seem to be done and actually I hate doing this as there's always a little comming out when fitting it back. My view is just that this will ensure a constant flow off oil after first startup after changing the filter.
Is this correct or does it hardly make a difference?