[quote]I will check and tighten the cylinder head bolts this week if necessary...[/quote]
This is only a temporary fix and not a repair!
Don't wait until it's too late to complain, okay?
Absolutely, my opinion is that if the ZKD (cylinder head gasket) leaks, it should be repaired as quickly as possible and not left to "experiment" for a long time, which ultimately does nothing but cause damage and cost.
Since my vehicle already had a ZKD/ZK damage (covered by warranty from VAG) at 63,000 km, and the second ZKD only lasted up to 76,000 km, I also conducted some investigation at the time.
In doing so, I also checked whether the head was still properly tightened and therefore chose ARL screws to reduce the vibrations of the head gasket over the long term.
See the technical article by Elring Klinger on the relationship between head gasket vibrations and screw torque:
http://www.ekmt.de/fachartikel/0101_mtz.html