if it's an ho motor it shouldn't have the seal between the 2 bearings on the pto side that was only 2001 and 2 after 2002 no seal between bearings is it possible you can take a picture of the cylinders on the outside intake then we can see if the cylinders are ho or not
check in front of ecm if it's oily and on top of the mag cover if it's oily in those spots the oiltank is overfull if you loose the lid then no more will run out
I got a wiring harness i plug into diagnostic plug and it will activate all electrics included gauge or you can go to a dealer and they can do the same thing