[Mysterytrain]

I've been suffering with a pesty oil leak for sometime now. All indications pointed to the new behr oil cooler. I was able to pressure test the cooler once it was removed from the car and found that it tested good. I reinstalled it with a new set of seals but unfortunately after a few days saw the dreaded drop of oil at the base of the cooler. The oil would drip from the seam [ black circle in the picture below ] and then onto the lip of the SSI heat exchanger below it. It would travel up the lip to the front of the SSI and drip to the garage floor or spill over onto the bottom of the heat exchanger.
Determined to find the source of the leak I jacked the car up on the driver's side..I usually jack the other side. I got under the car and cleaned the oil from the bottom and ran the car. Nothing..not a drop. Walked away and looked at it again the next morning. What I found was surprising. The drop of oil hung from the area near the weld { red circle in the picture below}. Enough had leaked out that the lip of the SSI was wet. I decided that the weld was bad. I removed the heat exchanger, drained the oil from the car, cleaned the area with carb cleaner and applied some JB Weld over the factory bead. Great balls of fire!! I'm pleased to say that my leak is gone. I figured I need to share the odd ball nature of this leak with everyone.