5W-20 is recommended in the Owner Guide
The 2002 Ford Taurus has overhead valves (OHV).
The 2002 Ford Taurus Owner Guide shows ( 5W-20 )
When the oil light comes on when a 2002 Ford Taurus is idling it means there may be a problem with the oil pressure that needs to be checked.
Because you need oil change
It is inside the crank-case.
Remove transmission oil pan
The oil pressure gauge on a 2002 Ford Taurus is located right next to where the battery is, toward the middle of the actual car. The gauge is connected to the front of the engine.
5w20 is the recommended weight.
The 2002 Ford Taurus Owner Guide shows : Motorcraft MERCON-V automatic transmission fluid
In a 1995 Ford Taurus : ( 5W-30 is the PREFERRED engine oil for the 3.0 and 3.8 )
The motor oil that is recommended for a 2000 Ford Taurus is 5W 20. This oil can be purchased at any retail or auto parts store.
DOT 3 brake fluid