In the latter case, regular (when performing maintenance, every 15,000 km of run) check the condition and tension of the toothed belt, and change it every 75,000 km.
Recommendations. With an automatic tensioner, there is no need to check and adjust the timing belt tension. In addition, in such a drive, the service life of the belt itself is significantly increased. However, this does not exclude the failure of the tensioning mechanism or oil leakage through the shaft seals. And the ingress of oil on the toothed belt leads to a significant reduction in its service life. Shedding of the teeth on the belt will result in poor valve timing and possibly serious engine damage. A broken belt will inevitably cause the engine to stop. Given all this, on engines with an automatic tensioner, it is advisable to check the condition of the timing belt, and if defects are found on it, replace it.