I haven't changed the oil since I've had it, because it was freshly changed when I got it, GTX2, and hasn't travelled much since.
The problem has only just popped up today as far as I've noticed, but I've been pretty preoccupied with the billion other problems this POS has.
It normally idles at 1100, but today it was dropping to about 700. Oil light was coming on from 1k and under.