[Fot] Aluminum connectors

[MadMarx]

Hi @ all,

hope you are getting well to the next year.

My car has many oil lines and also a lot of aluminum connectors and some of
the them do leak.
Is there any trick to seal them?
I think that I have tighten them enough and hesitate to tighten more not to
destroy them.

Is there a seal missing in those connectors?

http://ecx.images-amazon.com/images/I/41P918-F13L.jpg

Just an example what I mean for the system.

Cheers
Chris