A facelift is the revival of a product through cosmetic means, for example by changing its appearance while leaving its underlying engineering or design intact. Web sites, magazines or other industries may also be facelifted, for instance when their titles and products appear dated. The term probably comes from the same term used in plastic surgery. Purpose It is commonly applied to many kinds of products to keep them competitive during a model's product life cycle and to increasing the sales revenue of products. To earn high sales revenue and profits for as long as possible with one product generation, one must enhance the product's attractiveness from time to time. In automotive industry, the product lifecycle of mass-produced productions is always 4 to 6 years, and during that period, the competitor company will introduce new product to hold more market share. When new cars have launched into the market for 2 and 3 years, to keep their strength in the market, company will push out a facelift version to attract new and past customers to change their cars as they observe the sales revenue starts decreasing. This process is controlled by product life cycle management. Manifestation in Automobiles In automobiles industry, facelift often be shown as a small change in its outlook, updating its engine output, adding some new equipment or creating a new edition etc. In the case of the Mercedes-Benz E-Class (W212), the facelift introduced in 2013 for model year 2014 introduced a lot of significant changes. On the exterior, the are new bumpers with redesigned lower air intakes, slightly revised rear lights with LED technology as well as new grille design for the Avantgarde models. In addition, new single-piece LED headlights with integrated daytime running light was introduced, replacing the two-piece Bi-Xenon headlights with separate DRL on the lower air intakes on the pre-facelift models. On the interior, however, changes are limited to a new gauge cluster, an update to the COMAND system and a new steering wheel design. Mechanically, the updated M 274 engines replaced the previous M 271 units on 4-cylinder petrol models, a new E400 model with a 329hp 3.0L (later increased to 3.5L) twin-turbo V6 petrol engine was introduced, and a new 9-speed automatic transmission was introduced on V6 diesel models, replacing the previous 7-speed transmission. Sugar Water Gets a Facelift A good facelift can bring an increasing revenue and a better reputation