Every automobile engine needs an oil, but not just any oil will do. Modern engines are designed and built to exacting standards and require oils that meet very specific industry and automaker specifications to ensure long service life.
Depending on vehicle age, type of oil, and driving conditions, oil change intervals will vary. It used to be normal to change the oil every 3,000 miles, but with modern lubricants, most engines today have recommended oil change intervals of 5,000 to 7,500 miles.