Motor oil plays a vital role in ensuring the smooth and efficient running of your engine every time you start it up. It is therefore very important to make sure that it remains in good condition and that it is fully able to do its job. This is only possible if it is changed regularly to guarantee the quality of the oil and to make sure that it has not gathered too much dirt which could cause problems with the engine later on.
Read the whole article - How Often Should You Change Your Oil?