Focus Fanatics - View Single Post - **synthetic or not?
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Old 06-13-2013, 07:54 PM   #7
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Join Date: Mar 2012
Fan#: 96835
Location: Long Beach, CA
What I Drive: 2003 dark shadow grey metallic ZX3

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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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