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This is the reason I haven't gone to a synthetic. If you start with a newer engine/seals you probably wouldn't have this problem. Synthetics offer better lubrication due to the smaller and more round molecules. However, the slicker action allows is to slip beyond the older seals. I think as long as the leak is not bad you should stay with the syn. -At least you know which seals need replacing! (BTW, search for posts. This has been discussed before.)
Jeff
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