What oil for 2001 S-10 manual transmission?

For a 2001 Chevy S-10 with a manual transmission, it's recommended to use GM's prescribed manual Transmission Fluid, which is typically GM Synchromesh Transmission Fluid. Alternatively, you can use a compatible fluid such as 75W-90 gear oil if Synchromesh is not available. Always check the owner's manual for specific recommendations and ensure the fluid meets the necessary specifications.