If it is not the suggested gasket that is leaking then it is the oil pressure switch located exactly above the oil filter adapter. The black plastic housing could have developed a crack and oil will ooze downward and drip off the bottom of the adapter. I had this problem and changing the oil pressure switch took care of it.
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I had this problem on my 06 G6. The oil filter housing gasgket needed to be replaced. The oild filter housing is what the oil filter screws onto, and the housing attaches to the block of the motor, and theres a gasgket inbetween the block and housing. The oil filter housing is held on with three screws, and one is extremely difficult to get to. I also had to remove the belt and unbolt the a/c compressor.
Easy fix I just did. (replacing the oil filter adapter gasket which is a common leak). Remove the air cleaner tube and housing. Release the tension on the belt. Remove the two front bolts on the air compressor. They are nuts but the stud will come out too which is fine. Under the car loosen the third air compressor bolt. This will give you enough room to loosen the hidden bolt on the oil filter adapter. It only needs to be loosened as the adapter is slotted there. Remove the other two bolts on the oil filter adapter and remove. Replace the gasket and install.
oil filter screws onto an adapter housing which also has the pressure sending unit on it (above oil filter). This adapter housing bolts to the block with 3 bolts. if oil appears to be leaking from where the adapter housing meets the block (especially at the rear side of engine near bottom), then you need to replace the siamese o-rings between the adapter housing and the block ($12 part at dealer). remove lowest 12mm bolt and loosen top 2 12 mm bolts(top 2 bolts won't come out unless you drop the engine down, but loosening 1 inch is all you need), replace o-rings and retighten bolts. be careful not to get dirt/grit between block and adapter. just finished doing this to son's 95 2.7 v6 which was leaving an 8" puddle of oil after idling for only 1 minute-worked perfect
This is not an easy repair in your driveway, but can be done. 1st thing, have you checked to see if the oil filter is the issue or is it the drain plug? If its the oil filter housing gasket, you will need to remove the filter. The housing is held in place by the threaded bolt assy that the filter screws onto. You will need to remove that bolt, remove the coolant hoses. Clean the engine block surfaces, for the new gasket to mate to, clean the cooling housing surfaces, install the bolt through the housing, and install the gasket onto it. Then install the bolt/housing into the block and tighten the bolt. Install the coolant hoses, oil filter. Fill the cooling system with the coolant that you removed. Fill the engine with oil, start and check for leaks.
The oil filter mounts on an oil cooler housing that has an o-ring on the block side of it. The housing is held in place by the double ended connector bolt that the oil filter screws onto one side and the other goes into the block. This should be tighten to 37 ft/lbs. prior to installation of the oil filter. It may be loose or the o-ring might need replacement.
What upper portion are you talking about? Between housing and engine block? or where filter screws onto filter housing? If its where filter screws on sometimes when you chg. filter and you don't watch what your doing the old rubber Oring will stick on housing and you spin on new filter and it will leak because it will not seal because of the old Oring. Now if its comming from between the housing and block you will have to remove the housing and install a new gasget between engine block and filter housing.