RE: Engine hours vs Age
Actually the use of an accumulator for pre start lube goes way baCK TO CAR RACING , 1950'S OR SO.
And Rick is indeed correct , the throttrle on my DD at least is simply pulled from slow idle (400rpm) to stop., the last detent.
A gallon or two of oil will lube most of the tractor or truck transplants , the oil pressure will read at the mechanical pressure dial, and during cranking the low oil pressure alarm does not go off..
On a newer engine it will put a bit up to the turbo bearings , just losten the feed line to see the oil.
My USN DD book recommends a minuet or so of warm up at 700rpm then "modest" throttle till the water circ temp is over 160F.