Steve Brooks  

I'm using an evap core for oil, so no thermostat.  If I had one, I'd probably keep it to get a quicker warm-up.  

For another point of data, I measure the sump temp at the stock location, as well as the return oil temp from the cooler.  The sump was 215 when my return maxed out at 195.  Who knows how close the sump temp is to the actual return oil temp.  In other words, oil dribbles back into the pan in various locations, and gets mixed in with the oil that's sitting there, so the sump temp isn't necessarily the same as the oil that's dripping back from the engine.  

Cheers,

Rusty (trying to go flying later today, if I don't get heat stroke before then)