Just had my oil changed about a month ago. Everything was fine until a few weeks later after getting a resonator replaced. Oil light would intermittently stay on longer than normal when starting up, but would quickly turn off again and stay off. A few nights ago, the light began to flicker and stay on when slowing to a stop or idling after driving for some time, but shuts off again when I apply any amount of gas. Is this more likely to be something minor or serious? If I take it in for repair, what should I have them look for? Any help is appreciated