Miricle oil additive?

[brandon&trenna adams]

Alright, so is there a miricle oil additive I can count on extending the life of my porsche flat 6? Prolong, duralube, slick 50? I never used the zmax but have used various others in some of my cars over the years. Which is best in others opinions?
My car is running long on miles and even though it's an sc and reliable, I don't like the thought of putting 5 figures into it.
BA


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brandon&trenna adams
quattrorunner at earthlink.net