So i recently redid my lower and upper intake and valve cover gaskets and replaced intake manifold all together.... bein great for 2 month now and i went out of town for the fourth and came back to find a puddle under the monte. Not to big but enough to draw concern.
When i look underneath the WHOLE oil pan is wet with oil... but whats weird is the trans pan has oil on it..... on the opposite side from oil pan... which leads me to believe its from up higher. I cant see any oil leaks from the top and there nothing leaking from valve covers. Any ideas? i just degreased whole underside so i guess ill just have to wait and see. A friend mentioned the oil pressurer sending unit, ( mine has bein acting funny) where is that located? Just trying to get an idea of what else could leak from back side....also just to note there is no burning oil smell.... so no oil is leaking onto exhaust that i can tell of.

 

I assume you are running a 3800 v6? If so, I believe the oil pressure sending unit is on the passenger side, near the oil filter.

If it's a 3400 v6, the oil pressure sending unit is on the front (a little above the starter).