My plane is like Mike's as I have no oil cooler door and the plane gets above 200 in the climb, but stays right around 195 during cruise. That is in 100 degree wx here in TX. The previous owner removed the door due to high oil temps. 

Matt,

I finished my ES in April.  On the first many flights in Redmond in the winter/spring, the oil temps were perfect -- maybe even cool, especially running it hard in break-in (170-185 range).  I actually worried that they might be too cool as I never got em up to 200 even in hard climbs, go figure, but it was cool at 7500 + Redmond at that time.  Then I flew coast-to-coast in May in some warm temps, and they would go into the low 200s on climb before settling back to 185 - 190 ish in cruise, adjustable via the oil cooler door, which I have, and which works.  Then my recent trip to Oshkosh.  In that flight, my temps started climbing into the 230s!  Hmmm.  I suspected it was probe or electrical issue because they fluctuated too much to be reasonable, and an A&P agreed when he looked at my data.  Plus oil pressure didn't drop much if at all when oil temp spiked.  Diagnosis on the ground showed two things: (1) fastening and unfastening a Deutsch connector to the probe sometimes made the reading consistent with what made sense; and, (2) later, when readings started to fluctuate too much again in flight, the reading was ~ 50 degrees too high on the ground after sitting overnight and rose to implausible readings given the heat of the engine on touch when taxiing.  I am still debugging the issue -- I ordered a new probe.  I will see what happens when I get my new probe (for the g3x) in a few days and change it out.  All of my other temps, and most importantly my oil pressure, have been normal during these escapades, which I think solidifies the evidence that it's either a probe or elecrtical issue.  But if others know better, please pipe up!  Ironically, I had a GSU 25 failure (ADAHRS for %1 g3x, but the switch to the back-up worked like its supposed to) on the same trip, along with a starter failure.  My last name's O'Brien, and we can just chalk that up to the reverse luck of the Irish.

Happy and safe flying,

Dan

Matt,

My oil pressure has consistently been in the 47-48 range during cruise.  It sometimes moves a degree when I open or close the oil door and oil temp changes, but I never say any of what seem to be more random escapades well into the 200s do anything to oil pressure.  The A&Ps tell the pressure should be dropping if its getting that hot.  I haven't been able to fly the last 9 days but may try to debug this issue this weekend.  BTW, the probe wasn't real expensive at Spruce -- less than $70.  Never thought I'd say an aircraft part seemed cheap! :)