I just put this in my 2002 7.3L and was amazed at the difference it made with the motor noise, even my wife could noticed.
Holy crap this stuff is awesome. Put in at oil change. Truck LOVES it. Better smoother sound, better cold weather start.
I really like this stuff. I put it in my 2002 F-350 7.3L. It quiets the 7.3 L engine down a bit and seems to start better in the cold.
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Just put in 02 f-250 7.3 with 165000 . Going to see what I notice .