I noticed my truck was leaking the other day so, I cleaned off the bell housing and oil pan and checked it again. There is oil running down the back of the motor on the driver side. It runs down from where the heads attach to the block(it appears that this is not the point of the leak...it seems to be coming from the top of the motor), down by the driver exhaust manifold, and there are oil spots on the rubber boot for the front drive shaft that runs to the transfer case and there is some that hugs the bell housing. There is never a puddle under my truck and oil level is fine. I am not sure how long this has been going on but it has not leaked until recently. I changed the oil about 2 months ago and there was no leaks at that time. The truck is a 2006 with about 90k miles.

 

a couple things to check, check the turbo drain tube, see if it is wet under turbo. Look straight down on the oil filter housing, there are 2 sensors,one to the left of housing and one behind it, make sure oil isn't seeping out of those sensors. the oil filter housing sits on top of the oil cooler too so that area is the most likely to have developed the leak. it helps to look for the leak at night using a flashlite, makes it alot easier to focus your vision.

 

my 03 f250 leaked oil from same area your describing and it was the icp sensor

 

My brand new valve cover seals leak...