i'm thinking about setting up a custom oil cooler on my turbo LS..

question is, what would be the ideal size of the line for plumbing the oil??

i am deciding on either going with 1/2 or 5/8... what do you guys suggest??

 

10 AN stainless lines, forget rubber hoses.

With warm oil and 20-70 psi, you can watch the rubber hoses GROW as the pressure goes up.