SeaFoam to bad oil leak

[Diagram14]

In my efforts to zero out a potentially bad maintanence history I ran some SeaFoam through my cranck case for 100ish miles. Toward the end of the cycle a pretty substaintial oil leak developed somewhere on the high backside of the motor. I have already ruled out valve cover gaskets. Is there another chronic leak spot in that area? I cannot see back there and am done burning myself trying to feel around with the motor running. Thanks in advance...

 

[brian2sun]

Sounds like the rear main seal. Hopefully not though, it requires removing the engine (or possibly just the tranny, not sure on our trucks).

 

[Diagram14]

I would assume that a rear main leak would manifest through the bottom of the bell-housing? This one is definitly from up high. I can see the stream of oil actually running down the side of the bell-housing.

 

[cfranck1]

Could also be the rtv that the rear cam plugs get sealed with on the head.

Check this one out. Lots of pictures on were the 3.4L leak from and the guy even took pictures of a rear main job he did.
It might give you an idea on were to start to look for a leak.

3.4L Oil Leaks (150k) - YotaTech Forums