I have been noticing that my engine oil temperature will slowly rise to red line on approach and stay high through landing and taxi. During cruise it stays stable around 210. I have flown it on trips up to 2 hours and the temperature is always stable until I start to descend for my approach. Cowl flaps are closed on descent and final and open after landing. I am always in the green for manifold pressure until I pull throttle to idle above the runway.
At first I suspected the temperature probe, but I do notice ambient temperature around my feet increase as the temperature increases on the dial, so I do think it is getting hot. I have the stock gauges; no aftermarket EIS. CHTs always show normal and do not rise with oil temp. Do I have an oil cooler issue? What should I have my mechanic look at?
Thank you in advance!