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Motorcraft filters with an "S" in their part number signify that they use a silicone anti-drainback valve.
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Brian703 it would would be good to know which of the Motorcraft filter's besides the "S" series have the silicone anti-drainback valves as this question comes up from time to time.
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i believe that the FL-820S used to not have the silicone ADBV.