Please tell me which engine is in your Mustang. Some common engines for that year include:
* 6-cylinder: 200 cu in (3.3 L) or 250 cu in (4.1 L)
* V8: 289 cu in (4.7 L), 302 cu in (4.9 L), or 390 cu in (6.4 L)
Once you tell me the engine, I can give you the correct oil capacity.