Continuing my research on K20 oil consumption. I was lucky to find Flashy's thread on civicinfo 2 years back, and a guy with an FN2 mentioned a few things, that are worth checking: oil grade, valve clrearances, and the PCV valve. Oil grade is fine, I'm even using thicker stuff, than fully synth. The latter 2 I have no idea about, but I will check both as soon as I can.
Although I must say, reading this made something click. I've had this annoying hissing-chirping sound, since I bought the car, at low revs, bigger throttle. It wasn't an exhaust leak. Could it be, that this sound is either the valve clearances being horribly off, or the crank pressure escaping somewhere due to a clogged PCV valve?
If it were the piston rings, or valve stem seals, it should be puking blue smoke, although I've seen examples on the contrary. Wish me luck guys!