A bad wheel alignment causes a car not to track straight and it has other detrimental effects. It is caused by potholes, bumps, worn suspension and steering components and other kinds of impact on the wheels.
The choice of the use of synthetic or mineral engine oil is also a choice between long term cost saving and short term cost saving on servicing. It is more cost saving to use synthetic oil since it has longer oil change interval.
Preventive and corrective maintenance on a used car that is just purchased is important since buyer might not have all details of maintenance history and sometimes, people sell their cars due to faults without full disclosure.