Hello, now I am very confused about the tips of fitting provided by BERU
From their web site :
here we have the 'Tips on Fitting' : http://www.beru.com/english/produkte/gluehkerzen/einbautipps.php
"BERU recommends: Before installing the glow plug, grease its shaft and thread with BERU special glow plug grease."
Ok
afterwards looking a little bit further on the Diagnostic Aid , here another info completely different :
http://www.beru.com/english/produkte/gluehkerzen/diagnosehilfe.php
"The threads on all BERU glow plugs are nickel-plated. In this way seizing of the glow plug is reliably prevented. Thus, under no circumstances oil or grease the thread!"
So, now ( really humbling
) what in real life LOST friends do ??