Learning a little more about how to better care for your vehicles is a good idea for any number of reasons. It allows you to know if an unscrupulous mechanic is attempting to gouge you on your repairs - and that will save you money. It can prevent you from making unnecessary repairs - and that will save you money. It can help you locate a problem and fix it early, thus saving more money - sometimes a whole lot of money. It allows you to be more independent in an era where people are entirely too dependent on others to survive.