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Old 02-05-2012, 07:53 PM   #55
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Join Date: Dec 2011
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Location: Southgate, MI
What I Drive: 2012 Focus SEL silver HB

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If the S stands for Silicon Anti Drain Back Valve as nibyak states it is a better filter. The silicon is a more expensive, higher heat material than the nitrile rubber and withstands more heat cycles (more mileage). This is one of the improvements that allows the filter to last the 7,500-10,000 mile recomended service life.
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