I am posting this for educational value..
it seems when most thermostats fail they fail open.. well mine was sticking closed, and it appears to have been since I purchased the car earlier this year.
my oil temps sat on the 210 line since I had purchased the car.. water temp was always in the middle but straight up and down.
this was what I thought was normal.
I have a evolve tune
about two months ago I started getting some pinging when I accelerated hard, I thought it was a bad tank of gas.
filled up again and it continued.. switched stations and it persisted.. I was starting to wonder if i was getting 91 instead of 93.
then my oil temp started to move past the 210 mark about a month ago. two days after that the water temp gauge finally moved past "normal"
I parked the car and had my friend look at it. water pump was good, fan was good.. he said replace the thermostat.
when i finally replaced the thermostat temps all came back to normal, but I had pinched an oring, so it leaked..
2 attempts later and after pulling the plenum i was leak free and temps where rock solid.
using the functions in the cluster I get the coolant up to 83 degrees celsis and hold it unless I romp on it.. then I might see 85-86 briefly then back down to 83..
the oil temps sit to the left of 210 Fahrenheit and the car no longer pings on throttle tip in
the car is night and day different now. the evolve tune has really woken the car up.. I honestly really didn't notice it initially.. the car has been running hot sit I have owned it.
so if your oil temps seem a little high.. replace your thermostat.. it has made a huge difference in the way my car runs.