Hah, yeah I'm the same way 5w30 or 10w30 based on which one I can find.
I've noticed its slightly harder to get the car started with 10w30 in the winter, and the temperature needle is slightly lower in all season (but more pronounced in the winter). Other than that, it seems like there is not much of a difference. The manual states (at least for the Legacy) that 5w30 or 10w30 is recommended based on climate and altitude. For our climate, I think either will be just fine.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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