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The primary advantages I see to a synthetic are:
1. Lower cold viscosity for better FE, easier starting, better lubrication during warm-up. You can buy 0W30 instead of 5W30 or 10W30. Mix in some 0W40 if 0W30 is too thin.
2. Longer service interval. Saves time, offsets the higher price of the synthetic oil. Just don't run out between oil changes, as synthetic leaks and burns a little bit more readily.
Castrol Edge? Bah. I think they just needed a product priced higher than Castrol Syntec, to compete with Mobil1 Extended Performance.
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