Where is the oil drain plug located on a 92 Chevy s10?

The oil drain plug on a 1992 Chevy S10 is located on the bottom of the oil pan. The oil pan is the large, somewhat flat metal part underneath the engine. The drain plug is usually a fairly large bolt, often slightly recessed.

To be more precise, you'll need to get under the truck and look for it. It will be near the front of the oil pan, though the exact location might vary slightly depending on the engine (4.3L V6 or 2.8L V6, or the less common 2.5L I4). It's often easier to locate if you've already located the oil filter, as the drain plug is usually close by. A shop manual or online diagrams specific to your engine will provide a visual aid.