I posted a thread a few weeks ago, and still havent tracked down the leak so here we try again. I have attached some pics of where its coming from so maby it will help.
Here is one of the front of the motor

Here is one of where i think its leaking

Heres another

 

My first thought is that it is the oil cooler that is letting go.

 

How can i check that?

 

My truck is leaking at the same spot and Curtis told me to check the long tube on top of the oil cooler to the front of the motor. He said the O ring tend to leak in cold weather. I konw my truck will leak untill the motor starts to warm and then it will quit.

Jim

 

That is the typical sign that the oil cooler o-rings are beginning to let go. If you wait too long, the inner water jacket o-rings will allow the coolant to get into the crankcase and then you will have a big nasty mess.

Cody just posted a nice writeup on changing the oil cooler o-rings and gaskets.

Oil Cooler Repair.

 

Here's an exploded view.



And an oil cooler O-ring fix procedure: Oil Cooler O-ring swap.pdf

And: Oil Cooler Seal Kit At Guzzle's Diesel O-rings.