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yeah I'm thinking every 25 years or so .... mine was original after 40 years and was not leaking a drop . Was hard as a freakin rock though . Replaced it during my engine rebuild with an aftermarket I think , zero issues.
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1976 Yamaha XS360 ( Beats Walkin')
1978 911 SC Targa ( Yamaha Support Vehicle )
2006 Audi A4 2.0T (Porsche Support Vehicle )
2014 Audi A4 2.0T Technik (Audi Support Vehicle)
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