What type oil does a 1998 Chevy s10 pick up take?

The type of oil a 1998 Chevy S10 pickup takes depends on the engine it has. There were several engine options available that year. To know for sure, you need to check your owner's manual or the sticker under the hood.

However, generally speaking, 1998 S10s used conventional oil (though synthetic blends and full synthetics are fine and often preferable). The weight of the oil (e.g., 5W-30, 10W-30) is also specified in the owner's manual. Consult that manual for the specific recommendation for your truck's engine.