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From my experience in 2 other cars (Fords... I know, never again) it sounds like valve seals. If you don't know what that is, here's a simplistic explanation. The stem of each valve has a rubber (or something like it) seal around it. As the valve goes up and down it passes through these seals. If the hole in the seal is enlarged, more oil can pass thru. When the car sits for a while (like several hours) the oil collects around the seal and leaks into the combustion chamber. When you start the engine, PUFF, that excess gets burned off and you see it behind you.
Since I'm not a mechanic, I can't tell you why the oil doesn't get forced thru that seal constantly, under pressure. But the "disease" produces the symptoms you stated.
The good side is that you can still pass Inspection 'cause it only happens at startup and you're not really burning oil constantly.
2005 RAV4 2wd