Pinhole oil leak = oil on the ground, drip spots, eventully maybe a low oil light.
Complete oil cooler failure = oil pressure light, probable engine damage (maybe supercharger? is yours self contained?)

Pinhole fuel leak = possible ignition on any hot part on the front of the car nd explosion in engine bay
Complete fuel cooler failure = huge exploding fireball


I dont know, I just dont see it. Why would cool fuel add power anyway? Fuel density isnt a bottleneck