While I've read a lot of remarks concerning noisy wiper blades/arms, I am wondering if anyone has noticed any clearance problems with driver's-side wiper arm and underside of hood. While checking the oil, I noticed that the driver's-sider arm (the portion bolted to the shaft) has a flat spot on its edge where the arm is rubbing the underside of the hood. A corresponding wear spot on the underside of the hood is paintless and shiny as result of contact with the wiper arm. It appears that the hood hinges are set too low causing clearance problem and wiper arm to rub the hood. My wife reported a squeaking noise of the wipers during a long trip, but I didn't understand why until discovering the rub marks on hood and wiper arm. Could this also be the reason why so many owners report noisy and erratic arm movement?