After many years of owning my S197 4.6l 3V (Mustang GT), I finally got a UOA done by Blackstone Labs. I am very impressed with the results and so were the people over at Blackstone who conducted the analysis. Oil used was Supertech conventional 5w-20 and no additional additives were used in the crankcase such as seafoam or lucas oil stabilizer. It was changed at approximately 4,000-4,100 miles. Car was ran moderately hard during the ~4,000 mile oil interval. Let me know what you guys think!
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