problem with the oil
 

I've got a problem with my car. i've got an vw golf cl 92-model, and my oil light, and alarm is beeping and blinking. it only happens when I have driven on the highway, and is going to get out of it. do anyone have an idea of what it is that might be wrong? I've just changed the oil and filter. I'm from Norway, so i'm not that good in english ;)