Well, I couldn't believe this when I read it...but here it is straight from GM. This is based on a 2WD 4cyl S-10 2000 model year. I just pasted the oil pan removal description because you need to remove it to change the gasket.
Service Information
2000 Chevrolet S10 Pickup - 2WD | Blazer, Bravada, Envoy, Jimmy, S10 Pickup, Sonoma VIN S/T Service Manual | Engine | Engine Mechanical - 2.2L | Repair Instructions | Document ID: 512530
Oil Pan Replacement
Removal Procedure
Remove the engine from the vehicle. Refer to Engine Replacement .
Install the engine on a suitable engine stand.
Remove the oil pan. Refer to Oil Pan Removal
Clean the sealing surfaces and the oil pan. Refer to Oil Pan Cleaning and Inspection .
Installation Procedure
Install the oil pan. Refer to Oil Pan Installation .
Remove the engine from the engine stand.
Install the engine into the vehicle. Refer to Engine Replacement .
© 2011 General Motors. All rights reserved.