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This quote from Castrol's site should establish that Castrol sure see it as a synthetic!
"Myth #1: Once I use synthetic motor oil in my car, I cannot switch back to conventional motor oil.
Fact: Even if you've switched to a premium synthetic motor oil like Castrol Syntec, you can always go back to a conventional oil, but why would you want to? Consider Castrol Syntec Full-Synthetic motor oil a "super lubricant," as it seeks out and neutralizes harmful particles in your engine, fights sludge on vital engine parts, neutralizes acids in your engine, and is fully compatible with conventional motor oil. For example, Castrol Syntec actually engulfs particles preventing them from grouping together and forming engine sludge. Synthetic motor oils deliver superior engine protection versus conventional oils, and once you try it, while you can go back, we doubt you'll want to.
(This might also interest you. I cannot verify the hype though:)
Myth #2: Synthetic oil is only for new cars.
Fact: A quality synthetic motor oil can be used in old as well as new cars, including cars in which conventional oil was previously used. While using a synthetic motor oil in newer cars has been well documented, Castrol Syntec also provides added protection through enhanced seal compatibility- which is extremely important for used cars. Therefore, synthetic motor oils are beneficial for the good health, long life, and top performance of new and old cars. And any consumer looking to get the most out of their car should use a premium Synthetic motor oil."
http://www.castrolusa.com/products/productpage1.asp?sc=sdsbl&product_category=1&product_id=4#overview
Erling.
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My 240 Page
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