ya and it lasted me a whole 666 miles

Damn those evil Frams. LOL

Let'* aim back on topic folks.

The oil filter on the H body cars is located nearly in line between the two front tires just inside the subframe rail on the passenger side.

JDB.. Interesting you bring up an O ring. I have never found one on a 3800 unless the plug was replaced.

Yeah. Stick your head under the passenger'* side of the engine compartment, and you'll see it.

Due to it'* placememnt, you'll want a large drip pan to catch the oil in. There'* a frame or suspension piece that likes to catch some of that oil.

I've also never seen an O Ring on any drain plug.

One other note, when replacing your oil filter, on top of giving the gasket a light layer of oil, DO NOT OVERTIGHTEN THE FILTER You may need, well, probably will need, a wrench to get the old one off. Unless your hands are very weak, you do not need a wrench to put the filter back on. Just tighten as much as you can by hand (give it a good grunt) and watch for leaks. Overtightening will destroy the gasket.

mine has it, so does the 38 in my van....

That'* possible. Mine leaked so i added one. I assumed the previous owner lost it.