In a message dated 96-05-20 11:49:50 EDT, raven@halcyon.com (Mark McCulley)
writes:

>
>The recommended service interval for plugs, dist cap, etc is 30K miles. 
>I've never owned a vehicle where the plugs would last this long. What's the 
>list's consensus on changing these parts? Can they really go 30K or should 
>they be changed at 15K?
>
>-Mark McCulley

15K is about limit if you do a lot of highway driving.  Many American cars go
30K easy.  Especially GM wit the HEI.  Newer cars now claiming 100K.  Lots of
things effect plug life.  Vanagon's engine is streesed highly.  Plug
electrodes tend to burn away.

Dennis.