My owners manual says use the FL-500 S, but an addendum to the manual says use FL 2055 due to its "significantly higher filtration efficiency and capacity". When I go to the dealer parts desk their computer says FL-2055 subs to Fl-500 S. Another separate piece of info from the dealer also stated use the FL-2055. I called Ford Customer relations and his info also stated use FL-500 S. My owners manual was printed in 2010 while the addendum is dated January 2011. I would not be worried except for the quote in the addendum stating the 2055 has "significantly higher filtration efficiency and capacity".
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