You can also pull the oil cooler hoses as far as they can go and cover them with thermal tape, as air passing through the sill on its way into the cabin through the dash get heated up by the hot hoses.
Then push them back as they were before.
Also, if you have more time, change the oil cooler as per Sea’B’s modification. It really heps to keep the oil under 105degC, most of the time under 100.
But to do this mod appropriately you should aslo change the undertray to an Elise one, without the holes.