[HardcoreZ28]

I agree with Injuneer. Cryogenically treating engine parts is mainly a durability factor. I highly doubt it causes them to be slick like they are oily either....once again the brake rotor example.

As for your diesel engine example youhave to take into account such things as brand new rings and bearings when it was reassembled. That alone would contribute the highest gain in HP and torque.