I just installed a Hayden oil cooler on my O435 and dropped the temp 40 degrees.
I bought the oil cooler from Almuitech for $135.00. the old cooler i had measured 14"x8" and the motor temp was 200 degrees. the new cooler is 14"x20" with a 3/4" fip connection and they have the barb fittings. now my motor runs at 140 degrees.