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I know that the "Zetec 2.0" in the focus is the same as the Mazda 2.0 and I believe they haven't changed that engine since the early 90's.
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Pfft, typical Ford!
FWIW, I've switched over two Chevy four bangers to full synthetic after running an engine flush. One engine I switched at 70Kmi, the other at 88Kmi. Both engines are still in service today with zero ill effects. I would also advise you to stay away from high mileage formulas.