I'm not sure on a boxer engine, but on most upright engines that is a sign of valve guide seals going bad. When the engiine is off, the oil in the valve train leaks past the worn valve stem seals and accumulates in the combustion chamber. When you fire it up it burns off it a hurry and is not seen until the next time you fire it up after sitting for a while.
Over all. 1/3 of a quart being used over 3000 miles on an engine with those miles isn't so bad. I'm kind of impressed by that 
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX)
Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting.
Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well.
You can tell the lack of craftsmanship by the wrinkles in the duct tape.
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