[StuttgartDavid]

L: Oil cooler effectiveness is all about the airflow through the cooler rather than the size. Two coolers with poor airflow won't do much more than one. And I'm not talking about wimpy fans designed to move a little air in stop-n-go traffic, I'm talking about larger cfm volumes forced to go through the cooler, not around it, at 70+mph when the engine is under heavy load. Note the relative ineffectiveness of the Carrera cooler despite its fins and fan. It is simply shrouded from airflow, which is why the factory put in the under-bumper cutout on the later Carreras to give them more airflow.

Check into that mod for your SC. It is easily done, and the factory already did the windtunnel work to identify that area as a nice high pressure one (don't fight mother nature. Cooling is all about airflow, and airflow will only move from areas of high pressure to low). Also easy and cheap is the old trick of putting the turn signal/ marker light wires on a cannon plug so you can pull the light out for enhanced airflow for those high speed runs. These two mods made even the stock loop coolers on friend's unmodified SCs pretty effective even on hot days running Willow Springs with the POC.

Lastly, with all due respect, since I believe that you don't track your car, all this may simply be unnecessary. The factory really did know what they were doing, despite the American obsession with oil temps. Unless you regularly drive flat out in a desert environment, your factory cooling, or at most the Carrera cooler using the cutout, is probably up to the job if your engine is in time, running good gas, the engine cooler not blocked by crap, and the factory heat/air management trays, etc. are properly installed in your engine compartment.