At first, my oil light would come on when my oil level got to the bottom 1\4 of the dip stick. Now it's coming on with 1/2 to 3/4 reading on the dip stick. It comes on a few blocks after start-up, stays on for 45 seconds or so, then goes off. I'm guessing it's a faulty sensor somewhere. Could someone point me in the right directions or am I looking at a more complex problem. Oil pressure is good.