After last summers brutal heat I bought a used Carrera cooler on the forum here and installed it this past winter. This month in Florida already many days in the mid 90s and so far a very noticeable drop in oil temps. Very pleased with the mod.
FYI I did not add the fan either. I live in a small town without much traffic. On the rare occasion when there is a lot of idling (no airflow over the cooler) the temperature does creep up a bit. A soon as you start moving it goes right back down. Highly recommended mod if you are still using the trombone.
