Read the manual... it will change based on where you are and what temperatures your car see's during daily operations. Cars in Arizona run different weight oil than a car in New York... even if its the exact same car.
The recommended oil for the 2007 V8 Mustang is API "Certified for gasoline engine" Viscosity SAE 5W-20
10w30
( 5W-20 ) according to the 2007 Ford Mustang Owner Guide for the 4.6 liter 3V engine
According to the 2007 Ford Mustang Owner Guide : ( 5W-20 ) for the 4.6 liter 3V engine
5 quarts of 5w30 or 10w30
The horsepower on the 1988 Mustang was # 90 horsepower 2.3 liter engine # 225 horsepower 5.0 liter engine
In a 1996 Ford Mustang : The 3.8 liter V6 engine ( if you had a Mustang GT it was the 4.6 liter SOHC , V8 engine )
The 1999 Ford mustang was rated at 190 horsepower for the 3.8 liter engine and 260 horsepower for the 4.6 liter engine
( 5W-20 ) for the 4.6 liter V8 in a 2007 Ford Mustang
( .050 inch ) - spark plug gap for 1986 Ford Mustang - 5.0 liter engine
In a 2001 Ford Mustang : The 3.8 liter Over Head Valve , V6 engine ( and in the GT version , the 4.6 liter SOHC , V8 engine )
That has the 3.8 liter ( 232 cubic inch ) V6 engine ( unless it is a Mustang GT - that's a 4.6 liter ( 281 cubic inch ) V8 engine