I have been using the same mechanic for years. He is usualy very good at what he does but he has run into a problem. The oil light on my 02 turbo will come on at random times and he cant figure out the problem. The first time it came on i took the car to him and he replaced on of the tubes running to the turbo. Said it was a vacume tube and it had split causing a pressure loss. Car was fine for about two months when the light came back on. Took it back said the oil was a little low but everything looked fine. LIGHT CAME BACK NEXT DAY. He said the pressure is fine and he doesnt know whats wrong. Now looking for a new mechanic and some advise what might be wrong.