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To replace the exhaust manifold gasket on an Opel, first disconnect the battery and remove any components obstructing access to the manifold, such as the heat shield or exhaust pipes. Next, unbolt the manifold from the cylinder head, taking care to note the order and position of the bolts. Remove the old gasket, clean the mating surfaces, and install the new gasket. Finally, reattach the manifold, ensuring all bolts are torqued to the manufacturer's specifications, and reconnect any components you removed.

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