Thanks, nobber, I will check if there is any available here.. If I can't find it, would Loctite 510 be sufficient, do you know?
Mick, I think the manual says that some sealant is needed to hold the rocker cover gasket in place (marked with As):
I would assume some sealant would be needed to hold the gasket while positioning to the sump as well. Could it be you were talking about another engine? The TD5 should have a gasket. It's on the drawing below marked under 3:
Ok, guys, now I've researched the topic more and have found that Island4x4 and Britpart list Loctite 5900 and 5980 as an equivalent for STC50550, which is recommended in the TD5 manual. Will go with that..