motor craft 10w30 Generally it is marked on the filler cap. It is either 5w-20 or 5w-30.
5W-20 ( according to the 2001 Ford Mustang Owner Guide )
You need to unscrew the screws and remove the lid to remove the oil pan on a 2001 Ford Mustang with 3.8 motor.
Motorcraft ( FL-400-S ) engine oil filter for the 3.8 liter V6 in a 2001 Ford Mustang ( according to fordparts.com )
The 2001 Ford Mustang owners manual shows ( 5 quarts ) of engine oil with filter change
The 2001 Ford Mustang owners manual shows 5 quarts / 4.7 liters ( with filter change )
For a 2001 Ford Mustang : With engine oil filter change : 4.7 liters / 5 U.S. quarts of engine oil ( 3.8 liter V6 and 4.6 liter V8 )
A 2001 Ford Mustang 3.8 liter V6 engine takes ( 5 quarts ) with engine oil filter change ( according to the Owner Guide )
The best oil is what is recommended by Ford - check your owner's manual.
( 5.0 quarts ) with engine oil filter change for the 3.8 liter V6 engine in a 2001 Ford Mustang according to the Owner Guide
According to the 2001 Ford Mustang Owner Guide ( 5W-20 ) With engine oil filter change : The 4.6 litre Single Over Head Cam , V8 engine , in a 2001 Ford Mustang GT takes ( 4.7 litres / 5.0 U.S. quarts of 5W-20 )
With engine oil filter change ( 5 quarts / 4.7 liters of engine oil )
5W-20 is the preferred oil , according to the Owner Guide