My O-235 has the opposite problem...it runs too cool. My A&P say it should run at 200° to get rid of the condensation. I have to run it at 2400 rpm or higher to get it that high in the summer, otherwise it's at about 175°. It runs even cooler in the winter. But I believe there is some kind of STC, as I have heard of them having an oil cooler. Sorry I can't steer you in the right direction.