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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
at the shop I work at we had a salesman come in trying to sell us some additive crap when he did a bearing test with different oils mobil 1 didnt even perform as good as plain penz.... if it hadnt been done right in front of me I wouldnt believe it...just thought you might want to know.
Walmart sells those 5 quart jugs for $20. I don't think you got a discount, I don't know if mobil 1 is better then valvoline but I can get valvoline cases (6 quarts) for $10 from work.