1999 Chevrolet Silverado Small Oil Leak That Obvious On Garage Floor Been About

It's impossible to do that over a computer. We don't even know which engine you have. You need someone to actually look at it to see what's leaking. It could be as simple as an oil pressure sending unit or leaking valve cover gasket. Could be as serious as a leaking intake manifold gasket. Front main seals can leak too. If it's a real slow leak and everything is wet, your mechanic will wash the area, then add a small bottle of dye to the oil. A day or two later he will search with a black light. The dye will show up as a bright yellow stain that he can follow back to the source.