Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - **synthetic or not?
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Old 06-13-2013, 08:54 PM   #7
elsolo
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synthetic doesn't leak out because it's thinner, it has a seal swell value of <1 so nitrile and other seals shrink. Conventional oil has just over 1.0 and the "high mileage" oils are a little higher
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