I think it is just insurance to prime the
oil pump and get immediate
oil pressure upon firing.
The local tune/engine shop does this with all new engines be they ford or chev.
I'm gonna steal their patented pre-oiler when I start mine. It consists of a weed spray from bunnings...you know the 5 ltr spray thingy with a air pump on top. Bunnings sell them as cheap as chips for spraying plants.
The engine shop has removed the spray nossle and fitted a small tap/valve on the end of the hose.
They claim they can get up to 40psi of
oil into the engine to ensure oil is right thru an engine. They crank the engine without plugs for a short while.
Anyways...cant harm I spose.