| Engine | |
| Exhaust | |
| Damper | |
| Hydraulic |
| The same way every time | |
| By alternating the items checked during each inspection | |
| Only by a qualified mechanic | |
| In a variety of ways to make sure that nothing is missed |
| Increase fuel efficiency during highway driving | |
| Increase break wear | |
| Can cause drive wheels to skid when they have poor traction | |
| Are appropriate only in rainy and snowy conditions |