I too have a 89 towncar with 127,000 miles on it. I use mobil 1, amsoil was costing too much money. As for Z-max, well i tried it and my mileage inproves from 14.7 to 16.4. I thought this was great but the savings I got was about the Price of a new container of z-max. so do you want 6 of 1, or a half dozen of the other... hey this is only my experience. Go for it at least once, it does have a money back guarantee. Nothing to lose.
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