Cambelt tensioner on E30 - 6

How often do you need to retension the cambelt on an E30 320. The cambelt tensioner is apparently only there to keep the belt tight, but does not
readjust if the belt stretches. Is this correct? I'm still looking for the reason mine broke after 20,000km.
MW
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.