I used a synthetic blend in my car, because of cost. A synthetic blend will offer you 75% of the benefits of full synthetic, at half the price or less. And it doesn't "expose the leaks" so much as does full synthetic, or however you want to word it. If I raced my car I would probably run full synthetic in it, or if it was brand new I would, but my engine has 99k miles on it so I just use the blend.
