How often is it advised to have comprehensive maintenance work done for your vehicle?

It is advised to have comprehensive maintenance work done for your vehicle at least twice a year.

Explanation:

The benefit of maintaining one's vehicle is that it increases the life of the car. Mostly, maintaining a vehicle is less frequent than repairing parts. One should regularly check the fluid levels, tire pressure, lights, brakes and battery.  

Most cars use the fluids like engine oil, radiator coolant  and so on. Many fluids are also vehicle dependent. A common example of unnecessary vehicle maintenance is changing the engine oil too often. Comprehensive Vehicle maintenance should be done at least two times in a year. This would keep the vehicle in healthy condition.

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

answer; expert witness;