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The best test is a compression test.
Blue smoke means it's burning oil, due to worn out piston rings.
White smoke means it's mixing antifreeze and oil due to a bad head gasket or cracked head or block.
If you love the car as you say than be prepaired to shell out the bucks for a rebuild or replacement engine, because thats the only fix for your situation. You may not see any blue smoke but believe me its burning it, or you got a leak witch you say you don't. Its going someware and most likely its out the exhaust.
Is the car runnig little rough on cold start up in themorning for few seconds?? Because I have done quite a few headgaskets on QG18 Sentra aka 1.8 liter nissan sentra. here is the test. Fill up your overflow bottle to the full mark and check the coolant level in about 5 days.(drive it normally as if nothing is going on) If the level is down, your head gasket is gone. How about the check engine light , is it on?? post results.