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The Ford recommended oil weight is 5w-20
5 w 30
5W-20 ( according to the 2004 Ford Mustang Owner Guide )
The best oil is what is recommended by Ford - check your owner's manual.
5 W 20
My ( 1991 ) 5.0 LX Ford Mustang always used 5W-30 as recommended
( 5W-20 ) according to the 2004 Ford Mustang Owner Guide
( 5W-20 ) for the 4.6 liter V8 in a 2007 Ford Mustang
every 3,000 miles. oil and filter
5W-30 , according to the Owner Guide
5W-30 , according to the Owner Guide
5w20