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.
SOURCE: car is leaking oil
are you sure you did not leave the old gasket on the block from the old filter take the filter off and make sure
SOURCE: leaking oil bad
If you're certain it isn't your oil filter, then it can only be three other things. The first (and easiest) thing to check is a small diamond-shaped plate on the side of the block, under the intake manifold, towards the alternator. It has a bolt and a stud in it. Verify that both of those are tight. If they are tight, check the four bolts that secure the "push rod cover" to the side of the engine. The push rod cover runs the length of the engine and is located directly under the intake manifold. This was the culprit of my oil leak, and I imagine it will be yours also. However, if you find that those bolts are tight and no oil can be found leaking from that area, check your valve cover. The Fiero valve covers were stamped from very pliable steel and it is difficult, at best, to get them to seal correctly. Problems usually occur when people torque the bolts too tight and bend the valve cover. I recommend a product called "Indianhead" gasket shellac. Remove the valve cover and ensure all gasket surfaces are clean. Ensure the valve cover's gasket mating surface is straight - straighten with a hammer and block of wood if needed. Follow the directions on the bottle to the letter, making sure to coat your valve cover gasket surface, both sides of your gasket, and the gasket surface on the head.
Its hard to give a proper diagnosis without photos of the leak. The best thing to do is to clean up the area as much as possible and run it till it leaks. Then you should be able to see where its coming from.
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