[Mysterytrain]

I knew I would get some crap from you guys because of that picture. The photo was taken 2 years ago while the engine was being rebuilt at VCI and still on the stand. Its not quite that clean now..but damn close!
The oil was always hanging from the seam between the cooler and the case which I'm told is fairly common when the seals don't seal or the t-stat or breather leak. The top of the engine was clean and dry, so I thought it was the large cooler seal. Because I had the car jacked up on the driver's side there was a steep pitch that didn't allow the leak from the weld to sneak over to the seam but rather let it hang from the weld. When I saw the seam was dry the light went on in this tired old brain and I realized the weld was at fault. I would guess that Behr QC's the cooler under pressure and they just eyeball the welds on the oil return tube. Basically what you have there is the aluminum tube being welded to the casting. I'm sure I could have found the leak sooner had I used a dye.
The black circle is on the seam between the mounting nuts..the red circle is below it. Sorry they are hard to see.