Is it really ok for the GS500e not having an oil cooler?

[gsJack]

I doubt that oil evaporation accounts for much of what comes out of the crankcase vent of the GS.  The rather high oil consumption experienced above 50k miles or so on a worn GS engine that was probably looser than most when manufactured would be accompanied by a large amount of blowby and by water vapor. 

I have drained very little of anything from the air box drain tube in 180k miles of GS riding.  Any oil that may have evaporated in the crankcase was recycled thru the combustion chambers with the incoming fuel/air mixture.  If you want to catch it in a bottle you'll be hard pressed to determine how much of the mix is from exaporated oil.

The oil tests Sledge refers to are measuring evaporation from a sample heated to 250* centigrade for an hour,  GS oil might run half that temp.  As a matter of fact one of the first things I noticed on my first GS was how cool it ran compared to the 4 air cooled 80's Hondas I had before them.