Actually, there were several problems with early synthetics that would contribute to failures. Some of them did clean deposits off extremely well, leading to a similar situation. Many lacked the additives that extend the life of older seals (make them swell up, in other words), and there were some problems with lubricating properties matching up with certain viscosities while oil weight didn't. If you're really interested, there have been several very interesting threads of the past few years. Other problems, too, but those were the major ones off the top of my head.
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Re: Slightly off- thread...