Many, many years ago I had a scary time driving home from work in freezing fog one night after the oil pressure warning light in my car came on permanently.
Being in my early 20s, and being inexperienced about cars and mechanicals, I rang my father from a phone box and he asked me how the engine sounded. I told him that it sounded ok and he said to just drive slowly (which wasn't a problem in freezing fog).
In the end, I made it home ok and it turned out that the oil pressure sensor was faulty while oil pressure was actually fine.
A case of "Believe none of what you see and all of what you hear."
