It is known that consumables are something that is subject normal wear and tear. Pricing policies can be totally different, but it should not stop you, as a replacement will help prevent you and your car a serious problem.
Consumables include: timing belt, oil filter, air filter, fuel filter, brake pads, motor oil and spark plug, etc. Often, the same list of consumables in many cars, but the intervals between them concerning the replacement of different.. Much of this depends on the brand of the car and the performance.
In order to fully trust the car and keep it in good technical condition, it is necessary to make diagnosis, following which all consumables would be replaced.
Air filter, oil filter and cabin filter is recommended to be changed immediately, should bear in mind that the oil filter is better to change when changing engine oil.