Installing bravo one drive...button everything together. All went smooth. Notice oil leaking around seem from oil nipple. Cleaned up surfaces and lubed o-ring. Still leaking. Any thoughts. Not a fast leak.

what’s the sealing surface the red gasket or the o-ring? Or both?

Here is the o-ring mating surface

I don't see a picture of the bell housing? Was the o-ring installed on the bellhousing prior to installing the drive? Did you use grease to hold the o-ring on or weatherstrip adhesive? I recommend adhesive.

Didn’t take a picture of the bellhousing...yes o-ring was installed. Just ran out to store to get a new one. When I pull it apart again I’ll take a picture. I use marine grease to tack it in place