Help with oil leak

[Turbogst]

Looks like my 04 pathfinder has a lil bit of a leak lol. There was about a Qt left in her. Sitting in front of the truck with the skid plate removed there is this brassy looking wheel with two lines running into it. Its next to the block where the oil filter is on the pass side. what is it? Looks like its coming from there. Any ideas?

[Turbogst]

I can take a pic with my phone if needed

[Towncivilian]

Does the part that's leaking look like this?



If so, then it's your oil cooler. It's most likely a bad O-ring, which is not difficult to replace. Read this thread for more info.

[Turbogst]

Yes Sir, Thank you!!

[snelson54]

This is caused by temperature changes in the dissimilar metals...chances are the oring is ok and the bolt is just loose. The oring is less than $20 so might make sense to replace it, but you may stop the leak just by tightening the bolt which runs down the center of the oil cooler. If not, back the bolt out, slide the new oring into place, and retighten the bolt. Good luck getting a torque wrench on the bolt no room.

[CanuckQx4]

Mine also leaked from that cooler, I simply tightenned it down and it stopped leaking, I probably went past spec though while tightenning it. When I was searching the part was very cheap and easy to install. But I think I had already just done an oil change and thought tightenning it would be a good start, and it worked