| Answer | Crossword Clue |
|---|---|
| HASSLEFREE | Smooth-running |
| PURR | Smooth-running sound |
| OILED | Like smooth-running machines |
| LUBED | Like smooth-running engines |
| PURR | Smooth-running engine sound |
| OILED | Like a smooth-running machine |
| MOTOROIL | Necessity for a smooth-running car. |
