I went to Aman's Auto shop in Newark CA. They replace the valve cover gasket. When I left the shop and got home, about 30 miles away, my engine light came on, and there was still an oil leak. I called them, went back to the shop. They said the oil was residual and should go away in a couple of days. They got the engine light off. I went back to work, but then went I went home, checked the oil leak, there it was again, and my engine light came on again. Now, I have to go back again. Help