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Slovenian peasant here, I own an Opel Corsa C... Quite old. Still working, but it has the head gasket blown. The ECU is pumping more fuel - like 10% LTFT - so will not pass the technical revision at the end of the year. The compression test: 115-120 PSI with cold motor, even worse with hot one.
I will try to seal the head gasket with sodium silicate products (various brands)... To keep it running.