I bought a used Range rover today and on my way home it started crapping out on me. The Oil Light came on so I pulled over and checked out the oil, it was full and fairly clean, so I started driving and then the vehicle started losing power. So I pulled off of the road and swung by a jiffy lube. The guy checked out the oil, said it looked fine so it must be an exhaust problem. So I went to another service shop and they said that it wasn't exhaust, but that the oil was not making it's way into the engine. He thought It might need a new oil pump and to flush the system. However, I can't find a parts house that can get an oil pump so I don't know where to begin. I just bought the car 5 hours ago.... I don't know what to do.... HELP!!!!