Most car's production period (chassis life) is around 4 to 6 years. In between each chassis production period the car manufacturer usually will make minor improvements (design-wise and/or engine-wise) after 2 to3 years after its initial chassis introduction. This is to update the car's look and to stimulate market. The first half of the production period (before the manufacturer updates the chassis) is commonly referred as Pre-Facelift, whereas post half of the chassis production period is referred as Facelift.