My SPF has an
oil cooler and I get similiar results. On the highway, even in warm weather, I run
oil a little over 70 c and water less than 80 c unless I diliberately keep my gearing with the RPMs near 4000 or above. This winter I am going to install a temp controlled
oil by-pass of the oil cooler to get higher temps on steady lower RPM situations (e.g., highway driving). Oil coolers are not needed except under race-type driving situations.