Well, generically speaking it's a "gasket," but technically it's an o-ring and you can inexpensively replace it separately. It's by design not a matter of tighten tighter, as you just turn the cap until it hits the stop..
While you're at it, replace the o-ring on the dipstick, too ... 'cause it's the same vacuum leak.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
Last edited by lkchris; 08-26-2015 at 02:16 PM.
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