I was talking to my mechanic neighbor the other day. One topic was preventive maintenance of the car that I said is getting to be expensive. But he pointed out that a car breakdown is prevented by that maintenance. Come to think of it, a car breakdown will require towing services and emergency repair which is very costly. From a simple computation, expenses for a car breakdown is more than the cost of preventive maintenance. And if you will include in the computation the stress that you will suffer then I guess preventive maintenance is worth the cost.