Some of the discussions regarding using oil weights that are not recommended by the manufacturer would be of concern to me. In the "old" days, I think you could choose oil weights according to your personal preferences and not much would matter other than possibly fuel mileage. Today, with the costs of engine replacements, warranties, etc., I would be hesitant.... no, I just would not ignore the recommendations of Ford and what is marked on the filler cap. As far as synthetic, syn blends, etc., I say if you can spend the extra money, do it. Keep good records and oil change intervals as recommended. I have noticed that oil weights I used to purchase years ago are no longer carried at many retail outlets which is a clue.
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