there are oil sprayers under the pistons, I remmember HDDP said this cars oil runs the oil at a very high temp, hence the reason why we need synthetic oil, other wise this motor would coke up.

if you can get the the oil temp down with a larger oil cooler, the oil will absorb more heat from the pistons, thus cooling them further, and alowing more timing advance on the ignition. those of you who are getting ecu tunes, your putting more timing in your maps, so your burning the fuel longer in the cylinders which adds more heat to the piston. so you want to remove as much heat from the pistons as possible, thus the reasoning behind why the SRT6 has an oil cooler. more pressure=more heat= more detonation for that CR

so you can make more hp if you add more timing, but if you add more timing you might get detonation because of the pressure is heating the fuel too soon, so you reduce the pressure by taking the heat away from the piston, and avoid hot spots on the piston so you avoid pre-ignition. now you can add more timing due to resistance for detonation.