Do I stay on the cost?

Hello people! I have the following problem: I bought a used SAAB convertible three months ago. Was right after the inspection, there were no defects found! Now it came as it had to come: KApital engine damage including broken turbocharger. Cost point only for the parts approx. 4000,-€. Luckily when I bought a used car warranty. This takes over 100% of the labor costs and 60% of the material costs (km stand 80,000). These are also noc h 1800,-€. Now my question: According to common jurisprudence, the dealer (Toyota dealer) would have to pay the complete damage (defect liability). Do I now turn to the dealer so that he pays everything? Or does the insurance have to go so far in liability and the dealer has to cover the rest? Or do I even stay on the 1800,-€? Who knows advice? Greeting Philipp P.S.: I know that this does not belong here, but in the insurance forum nobody answered t.