We have a awesome oil cooler set up. It is a external deal and can either be mounted in front of the condenser, or we can stack a pair of these in front of the condenser, one for engine oil, one for transmission fluid.
Or they can be independently mounted with its own pair of 5 1/2" fans. The coolers with no fans are 4300, With fans $600
Check it out, it don't get no cooler then this.
Oil Cooler with twin 5 1/2" fans