will depend on how your drive most people change between 3 to 5 thousand miles
The Ford 4.0 liter V6 engine takes ( 5 quarts with engine oil filter change )
no its has a chain!
If you need to ask, then the answer is no. It's a bit complicated.
to answer this we need to know what size engine and whether diesel or gas engine
The 1999 Ford Mustang 3.8 liter V6 engine takes : ( 5 quarts with engine oil filter change )
You will need to remove the engine shroud from inside the cabin to access the engine and plugs.
The 2001 Ford Mustang owners manual shows ( 5 quarts ) of engine oil with filter change
What does your owner's manual say? I would change them if the engine is not performing as it should, you are getting poor mileage, or you have over 75,000 miles on these plugs.
5 quarts with engine oil filter change
Do you really need to change your timing CHAIN on a 2003 Ford Ranger 3.0 L already ? How many miles have you got on it ?=)
With engine oil filter change : ( 6.0 quarts / 5.7 liters ) for the 5.4 liter V8 engine in a 1997 Ford Expedition
With engine oil filter change ( 3.8 liters / 4.0 quarts of engine oil ) for the 2.0 SPI engine in a 1997 Ford Escort according to the Owner Guide