where is the problem? audi tt

[cifan]

Hi to everyone
I am joining from Turkey.
i hope you will help me for my problem.
The rear wheels remain stuck in turns like this:
a few months ago I changed the haldex oil but could not find a filter
the problem has improved temporarily but I am having the same problem.
should I change the filter? Can I use Volvo, febi or ravenol as a liquid?
I would be grateful if you help!!
thanks you
(my car is 2004 audi tt )

 

[SootySport]

Have a read at this thread https://www.audi-sport.net/xf/threads/rear-end-locking-up.384005/#post-3383082