A so-called LongLife oil is a fuel-efficient engine oil, typically with SAE areas from 0W-30 to 0W-40.
If you drive a car with LongLife Service regime (e.g. some vehicles by Volkswagen or Audi), you have to use LongLife oil.
The vehicle calculates the status of the motor oil, using various measurements. It will then show you the remaining time/kilometers until the next service is required.
In order to do this, data such as gas consumption, oil level, oil temperature, speed, the manner in which you brake or speed up and the revolutions per minute will be evaluated.
Even an automobile using LongLife engine oil will not be able to overcome any fundamental laws of physics or chemistry: if you use your vehicle mainly in the city or for short distances, the motor oil will wear out more quickly and you will have to change the oil sooner.
Advantages of LongLife oil/ LongLife servicing:
The service intervals are not set; they depend on how you drive your automobile. Appropriate driving (that is economical driving; long distance driving) will increase the time until your next oil change is due. That will save you money. However, you have to keep in mind that LongLife oil might be more expensive than conventional motor oil.
Please note: vehicles with LongLife servicing need those specific motor oils!
If you do not want to use LongLife oils, then visit your repair shop and get your car reset to a conventional service regime (set time intervals for changing motor oil).
Keep in mind that it makes a difference whether you use oil that is actually approved by the manufacturer or oil that only corresponds with the requirements that are necessary for approval. This is especially important when it comes to issues connected to warranties or more.