Helps prevent leaks in various components of your vehicle , Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) , GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle , Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type , GM regularly updates production and service part designs to integrate new materials and technologies