Check the owner's manual to see if your driving habits are considered to be "severe service." This type of driving requires more frequent oil changes, warns the Car Care Council. Have the oil changed accordingly, usually every 3-5,000 miles. For less wear and tear on the engine, drivers in cold climes (sub-zero driving temperatures) should drop their oil weight from 10-W30 to 5-W30. The typical oil filter consists of a high-strength steel housing containing various types of filtering media. An anti-drainback valve prevents oil from running out of the filter when the engine is off. The oil filter sifts out contaminants, allowing the oil to flow through the engine unrestricted. For best results, consult your owner's manual, but consider that your driving probably constitutes a severe maintenance schedule.