2.2 litres
10w-30 fully synthetic
I have a 92 Diamante Wagon. And the drain plug on my car is on the bottom left (driver side). You need a 22mm socket wrench to open it. Hope that helps.
2.85 quarts
either, but id use oil. God Bless
The oil pressure switch should be above the oil filter on the back of the engine on a 2.2L.
Originaly the 92 accord called for a 5-20 oil but at your current age I would recomend using at least a 10-30 but not sythetic
80/85 weight
If your 92 Grand Prix is running hot you probably need to check the oil. If the oil is OK you should check the water and add water if needed.
Manual says to use SAE 75w-90 or SAE 80w-90 gear oil
I have got a 92 wrangler and mine uses 6 quarts of oil, since they are the same motor yours should also use the same, assuming that you have the 4.0L 6 cyl motor
The attached links should answer you're question. Kyrasis6 Mazdatruckin.com