A complete servicing of the movement involves the disassembling of the movement, thoroughly cleaning the components and reassembling it with fresh and necessary lubrication. Watches are, in essence, timekeeping machines, which of course have been beautified to capture our attention. Like every other machine, the engine that is propelling the entire functionality, which is the movement beating inside, needs to be oiled regularly. It’s like the engine of an automobile. If we look at the fundamental principles of automobiles and watches, we find that, just like in cars where there are multiple moving parts that require constant maintenance, a watch is also a complex machine that is made up of several moving components including gears, which need to be cleaned and lubricated to ensure that there is as little wear and tear and friction as possible. The theory that is applied here is that the oils and grease used inside lose their properties and become sticky, and instead of lubricating the movement, they create friction and damage the inner mechanism. This is applicable for automobiles as well. In an automobile, the engine transmits energy to the drive shaft, which in turn rotates the wheels. Similarly, in a watch, the mainspring transmits energy into the gear train that rotates the seconds hand. While auto experts recommend that a car should usually be serviced after every 5,000km, when it comes to watches, one must get their timepiece serviced at least every five years. Mechanical watches, in particular, typically require servicing every four to five years, but a maintenance check-up should be done every two years. In fact, if you notice that your watch is losing or gaining time, it is an indication for you to get the watch checked at a service Centre.