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 3,000-5,000 miles. For less wear and tear on the engine, drivers in cold climates (sub-zero driving temperatures) should drop their oil weight from 10-W30 to 5-W30. Your mom and dad would probably suggest simply moving to someplace warmer.