The quick test for belt-in-oil timing belts
In modern engines with belt-in-oil (BIO) technology, the timing belt runs in an oil bath. This reduces friction, lowers CO2 emissions and ensures quieter operation. The drawback, however, is that low-grade oils can lead to premature wear of the belt. And up to now, it has been difficult to assess the belt’s condition simply by looking. …
| September |
| 5 |
| 2025 |


