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The S2000 has a heat exchanger for Oil/coolant.
That's good, it should be a help. When the engine is cold and idling most of the pumped oil will be bypassed by the pressure regulator. You have nice oil, but it might take a second or two to come up to pressure. During that time there would be enough oil left on the bearings to work. If it was a daily driver it would shorten life a bit, but not what you are seeing. The bypass oil probably doesn't go thru the heat exchanger though, so it will still warm the oil slowly. Living in Florida is a big help here.
My FF and the V8 pushrod engines were all designed on slide rules and built by barely post WWII equipment. The S2000 would be far more accurately made and maybe had the benefit of computer modeling.
I think you mentioned better sources than me for finding out your oil weight. Even the owner's manual should help here, it might mention heavier oil for summer use for example. I'm a little surprised your oil rep didn't comment on this or venture an opinion...
If you want solid engine info, I go to the forums on SpeedTalk. I just did a search for "Speedtalk oil weight" and came up with some good info like what I am saying. Probably because I read it there
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http://speedtalk.com/forum/viewtopic.php?f=1&t=33618. Also check "SpeedTalk oil pressure".
There's a log of good info on the Joe Gibbs oil web site. From what I can tell and all the info they are willing to put out - they make good stuff.
They are very specific on the SpeedTalk forum like the guy asking the above question " used to run .035 clearance, but now I am running .025". Many of the people posting there are actually camshaft designers, cylinder head designers and people with dyno budgets in millions of dollars a year. Some of them actually did write the book on this stuff. Nobody is bragging on these things so it takes a while to figure out who is who.