ACA sells a plate that covers the oil cooler. I have one on mine and still only get about 150-155 deg, on a 30 degree day. I was showing about 135-140 before that. The plate costs about 20.00. There was quite a bit of discussion on this subject a month or two ago. Let me see if I can find it and bring it to the top for your reading pleasure.
I have a search box, but there has been a lot of discussion on this subject. Many people don't seem to have a search box.
Bill