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Dave is correct.
If Porsche had specified a Viton seal, perhaps they would have lasted longer? But the vacuum issue would probably have defeated even the Viton seals.
Ironically ,specifying 1RS instead of 2RS -only one standard Buna seal on the inside of the bearing would have been the best solution? That is what many aftermarket replacements do. And the bean counters would have celebrated the saving of the cost of 1 seal and the Porsche owners would have enjoyed longer IMSB life?
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