Car expenses can be really an add-on. An auto car mechanic may recommend you change the engine oil as often as every 3,000 to 4,000 miles (about 6437.38 km). Additionally, you need to rotate tires every 4,000 miles or so and replace them every 5 to 6 years. An auto mechanic may also advise you to change the air filters every 15,000 miles.   To be precise, that's just a short list of...