To start, I am talking about enigne oil not transmission oil, I already have an oversized Tranny cooler. I know I have the block off plate and i do not have lines running thru the radiator for the engine oil, I would like to put in an external tube fin style oil cooler for the engine oil. I live in AZ and the engine oil gets pretty warm running up hills pulling my camper or boat, I have the edge chip which displays the temps so i know when i need to slow down. I have flushed and put in nice coolant from gm with a booster from amsoil, and have synthetic heavy duty transmission oil and rear end oil, the truck tows like a dream for a half ton, if i can keep the engine oil temps down it would be all set. No i do not run the oil too hot to damage anything. I want a replacement for the block off above the oil filter to run oil to a cooler and back in from there. I am having trouble finding this. I don't really want the hoses that lead up to the radiator, since i am doing an external. Thanks for all the help in advance everyone!