We have a Cuisinart DGB-300 Automatic Grind and Brew 10-Cup Coffeemaker. My wife fills it to the (highest) 10-cup line and I fill it to the bottom of the black plastic ring atop the carafe (estimated 1-2 cups more). The pot has brewed this extra amount of water with no apparent trouble for weeks. My wife is concerned that over time this will wear out the coffee maker. Is this true?