PORSCHE
| Engine | Interference | Recommended Interval |
| 2.0L | YES | (9) |
| 2.5L | YES | (9) |
| 2.7L | YES | (9) |
| 3.0L | YES | (9) |
| 4.5L | YES | (10) |
| 4.7L | YES | (10) |
| 5.0L | YES | (10) |
| 5.4L | YES | (10) |
| Notes: |
| (9) Under normal operation, replace at 45,000 mile intervals. Check tension at 2,000 miles, then every 15,000 miles. |
| (10) Under normal operation, replace at 60,000 mile intervals. Check tension at 2,000 miles, then every 15,000 miles. |