I was driving home today and my oil light came on and started bleeping, I pulled over and checked my oil and topped it up as it was about half . Bleeping started again about 1/4 mile down the road. It stops for a short time if car is revved past 3k . As I got off the main roads into speed hump zone I noticed 1st and 2nd gear was really snappy and tried to break my neck with slight throttle , any ideas on what this could be please. Only recent thing I have changed is the inlet manifold temp sensor