okusa wroteHere's the oil cooler data. Both data points taken from the last session of the day, about mid session. Blue and cool colors are from today, 28 May 2016. Temperature is 82 degrees. Red and warm colors are from my last visit to ACS, Feb 20. Temperature then was 76 degrees.So how did they perform?
Today's fastest lap was 1:54.47 which is shown. Fast lap Feb 20th was 1:55.882.

I know this graph looks busy, but the two squiggy looking lines towards the bottom of the graph are the oil temperatures. The smooth lines almost directly above it is the speedometer. The square step lines above that tell you what gear I'm in.
Lines above that are temperatures, and water temperatures. You can see that my Feb 20th water temp shows 405 - a bogus result (my engine coolant temperature sensor was broken).
I did not go into limp mode at all today in warmer temperatures. DCT gear shifting was a little laggy towards the end of a session (1 second delay). I only had Motul fluid, was not able to get the DCT cooler from do88 installed and ready for this weekend.
This is with a CSF radiator + do88 oil cooler only.
I think I'll be able to get a better read at Buttonwillow since that track is horribly problematic for my cooling systems.