Thanks to everyone for your responses.

While under the car yesterday I played around with this a little. I was *hoping* the grommet just wasn't seated fully and maybe I could snap it into place but alas, not the case. There's a ridge along the upper edge of the grommet that is allowing oil to leak from beneath it. I wonder if I goofed and put it in upside down? I can confirm that there is no other leaking from anywhere else in the assembly.

I picked up some gasket maker. I was able to get it totally clean with brake cleaner yesterday. I'll scuff everything up and run a clean bead around the perimeter. Just seems like such a hassle for something so simple. The car isn't for sale any time soon, maybe I'll plan to replace the grommet and do the whole bit the next time I have the pan off.

@ Bill, I like the silicone tape over the RTV idea. Do you have a particular product you'd recommend?