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Just a quick data point.
My civic calls for 5w30, and it had that or 10w for its first 150,000 miles. I then switched to Mobil1 5w20. I've had zero problem with leaks or burning oil, even with an extended 10k change interval. The oil level stays the same the whole time.
The conventional wisdom (wiz-dumb?) is not to switch a high-mileage car to thin / synth oil. I had no trouble doing it.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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