Valve Spring: Labor Times
| Standard Hours | Manufacturer Warranty Hours | Skill Level | Notes | |
| Replace | ||||
| Single Timing Chain | ||||
| M3 | ||||
| All Cylinders | 27.2 | 19.4 | B | |
| Dual Timing Chain | ||||
| 328i | ||||
| 2WD | ||||
| Convertible | ||||
| One Cylinder | 20.0 | 14.5 | B | |
| All Cylinders | 22.5 | 15.9 | B | |
| Coupe | ||||
| One Cylinder | 20.0 | 14.4 | B | |
| All Cylinders | 22.5 | 15.7 | B |