Recently I started to notice oil spot under my car. Dealer told me that I need new power steering pump because the old one is leaking. However from what I can see, the fluid is coming out from the cap on the power steering fluid reservior. It seems that the cap isn't tight. Does anyone have this problem? Is there anything that I can do? I'm thinking something like a O-ring between the cap and the reservior bottle. Is there anything that I should know? Thanks!