Cam chain tensioner replacement.. not sure if needed..

[Sirocco20348]

Hello,

EDIT: Sorry the title should refer to the gasket for the tensioner.

I usually change things when I know they are gone.

I am about to change my valve cover gasket because I have oil in the spark plug wells when I change the plugs..., and I have read that while I am doing that I should really do the Cam Chain tensioner gasket and half moon as I have the cover off.

Is there a sure fire way to identify if this needs replacing? Or should I just change it anyway? I am procrastinating over changing it as I need to order the gasket and the special VW tool.

What are peoples experiences.

Thanks.