A 1997 Ford Transit 2.0L likely uses
15W-40 engine oil. However, this is just a general recommendation.
You absolutely must check your owner's manual. The specific oil type and viscosity will be listed there, and it's the definitive source of information for your vehicle. The manual will also specify the correct oil capacity.
Using the wrong oil can seriously damage your engine. Don't rely on online guesses; consult your owner's manual.