the Mercury Montego, the production vehicle revived the more widely-recognized Sable nameplate at the 2007 Chicago Auto Show. While the 2008 revival of the Ford Taurus (renaming the Five Hundred) largely ended retail sale of the Crown Victoria, the Sable remained below the Grand Marquis in the Mercury range. While approximately 10 inches shorter and 500 pounds lighter than the Grand Marquis, the fifth-generation Sable was the first produced as a full-size car. For the first time, the model line was offered exclusively as a four-door sedan (no Mercury counterpart of the Taurus X wagon was developed). Front-wheel drive remained standard, with all-wheel drive becoming an option for the first time. In the transition from the Montego to the Sable, a number of changes were made to the body and chassis. Alongside the addition of the 263 hp 3.5L V6 and 6-speed 6F automatic, the exterior underwent several revisions, including a revised front bumper and grille, redesigned headlamps; the LED taillamps were retained, but given white lenses. The fifth-generation Sable adopted the trim lines of the Montego and Milan, with an unnamed standard trim level and a top Premier trim. Water pump issues Water pumps on the 2008 to 2009 Mercury Sable equipped with the 3.5L Ford Cyclone V6 have a tendency to fail and potentially ruin the engine when they do. The water pumps on these engines are internally mounted and driven by the timing chain. As a result, when they fail, antifreeze is dumped directly into the crankcase; mixing with engine oil and potentially damaging the head gaskets and connecting rod bearings. These water pump failures could occur without warning, and repair could require engine disassembly or removal to access the water pump, or in some cases, engine replacement. A class action lawsuit was filed against Ford as a result of this issue. Models Special editions A few rare special editions of the Sable were made, all consisting of first generation models. During MY 1987, Mercury introduced a special edition of the Sable called the "LS Monochrome Edition", which as an option would color the bumpers, side trim, and wheels white. It was only offered during MY 1987; the production quantity is not known and it is also unknown how many still exist. During MY 1989, Mercury created a "50th Anniversary" edition of the Sable, to celebrate Mercury's 50th Anniversary. Keeping with the name, only 50 were sold,