Another change was made for the next event in Canada: the car received a larger radiator to improve the cooling of the power unit at a track where Mercedes had suffered failures of their ERS unit the year before. The larger part necessitated a bulge on the engine cover. The most obvious aerodynamic change was the curve rear wing which was introduced during 2015 Belgian Grand Prix, the introduction was to allow for a decrease in drag without the associated loss of downforce. The curve rear wing was again used at the notable track: Autodromo Nazionale Monza, hosting the 2015 Italian Grand Prix.