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Message: <blockquote data-quote="71buickfreak" data-source="post: 1904198" data-attributes="member: 8373"><p>While the overall viscosity is the same, the molecules in synthetic oil more consistent in size. I did slightly misspeak about the reason for potential leaks with switching. Synthetic can leak through smaller gaps in seals, but there is an additional process at work- conventional oils create a lot of sludge, synthetics don't. After a couple of oil changes, synthetic oil will have flushed much of the sludge out of an engine, exposing the seals to the molecularly-smaller oil. If you cleaned out the engine, you have had a leak regardless of the type of oil, but it will be more prevalent with synthetic.</p></blockquote><p></p>