i reuse it until the gasket can stand on end on your palm. If it does, it is too stiff already to be doing any "sealing" on the cover.. well, at least that's how we do it in the shop i go to..

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Mike

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1975 200 - Sold (no pix);
1978 200 - Sold - http://www.pbase.com/hboy/redbaron
1979 300TD - Sold
http://www.pbase.com/hboy/greenwagon
http://www.geocities.com/hboy726/300TD.html
1985 230E - now my daily driver...