So, after a long consideration, I decided instead of risking a motor damage to change the control chain. Since the grinding noises have increased a bit. From the Saab workshop and after 4 days repair (remove engine, change chain set and install engine) everything again super quiet. The reason here was that the balancing chain had been extended and the spanner had fully extended. Then the from GM gave a great quality installed. Because with almost 104,000 km such an extension, is Has anyone here made this experience in this km of performance? Car is a 93 II, Built 2006, 1.8 T, 196 HP, combined body.