Okay 2 types of oil cooling system fitted to these trucks.
Light duty , and heavy duty.
light duty, Oil cooler lines go from the oil filter housing to the radiator. oil cooler is built into the radiator.
Heavy duty, Oil cooler lines go from the oil filter housing under the radiator and in front of the radiator there is a mini oil cooler.
Depending on where the leak is, if there is a weakness in the 350 it was with the oil cooler lines. It turns out that most of the oil leaks from the cooler lines has nothing to do with seals. It's a problem with the cooler line.
Yes there are oil cooler lines that come off of the oil filter adapter, they feed in to an oil cooler that is built in to the radiator.
Those lines are what oil flows through so it can get to the oil cooler and cool the engine oil down, It helps the life of the engine.
Most oil cooler lines run from the transmission to the radiator and can easily be seen from under the vehicle.
oil cooler is located on lower right side of engine need to get under vehicle to see it
Yes you do.
your oil cooler is leaking
Head gasket & oil cooler
Start with the oil cooler
Head gasket & oil cooler
steel tubing
do you remove motor mount to remove oil cooler lines on 2001 chev 2500 hd 4x4