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    Z Max Engine Formula... Fact or Fiction?

    My 2002 Dodge Stratus (2.4L 4cyl) just went over 250,000 miles. Been using Z-Max regularly since 140,000 miles, both crankcase and transmission versions. The Stratus runs strong, uses a quart of oil about every 2500 miles. I also use Mobil 1 15,000 mile Synthetic and an extended mileage oil...