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The seals gaskets are not generally replaced unless they are leaking, they can last the life of the car. The 2 front seals (crankshaft and cam) are best replaced when a timing belt change is done as the disassembly work is about the same. The rear crank seal is a completely separate job that involves removal of the transmission, never done as a preventive measure, only if it is diagnosed to be leaking, otherwise leave it alone.
Gaskets: The oil pan gasket rarely leaks and therefore should be left alone, the valve cover gasket should only have to be replaced if the cover is removed for any reason, it sometimes does leak, but if it is OK leave it alone.
Keep your flame trap serviced to help discourage leaking seals and gaskets.
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David Hunter
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