For between 40 and 100 dollars normally, one can keep an old car in top condition. Otherwise, the various buildups and things within the engine can lead to a car breakdown which might end up costing you more than by using prevention methods. I suppose it's like someone going for doctor checkups to keep from running into major medical problems. However, an even cheaper method would involve you doing the various prevention methods like changing the oil yourself. Does anyone think that's a better way?