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The recommended oil is SAE 5W-20
The 2006 Ford Mustang V8 engine take 6.0qts of oil
5 w 30
According to the 2006 Ford Mustang Owner Guide : With engine oil filter change : The 4.0 liter Single Over Head Cam , V6 engine takes : ( 4.7 liters / 5.0 U.S. quarts of 5W-30 )
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 ) for the 4.6 liter V8 in a 2007 Ford Mustang
( 6 quarts ) with engine oil filter change on your 4.6 L - 2006 Ford Mustang
According to the 2006 Ford Mustang owners manual ( 5W-20 engine oil ) is used in the 4.6 liter 3V engine
5W-30 , according to the Owner Guide
5W-30 , according to the Owner Guide