My 93 does this as well. My low oil level light(amber), not to be confused with the oil pressure light(red) comes on quite often as well. It happens when: I am a 1/2 quart low, parked on a hill before starting the engine, or restarting the engine within a minute or so of shutting it off. For two years now it has annoyed me, but most of the the time its off. I notice if my oil level is completely full, it never comes on when parked on a hill, but sadly still after a short restart. I use Maxlife 10 30, or 10 40, don't remember.

Sorry I offer no help, didn't want you to think you were alone

Jeff