Well, have you? Proper maintenance of oil and oil filters in your car is more important to the livelihood of your engine than the use of the dozens of(...)

Original Toronto Star caption: Well, have you? Proper maintenance of oil and oil filters in your car is more important to the livelihood of your engine than the use of the dozens of oil additives on the market. Some do what their advertising claims, although some of the additives already exist in high-grade motor oils.