It depends on the climate you live in but a 5W-30 works in most areas.
At the bottom of the engine.
6 quarts with filter
Check the auto parts websites for a 2002 Chevy pickup. There should be a picture of the individual parts.
dex/merc 3
5w30 only
The Oil Pressure Switch is located on the driver's side top rear of the engine on your Chevy Pickup.
5W-30
check the oil
5w30
what engine?
5
It depends on which engine you have.