I changed it today, the tensioner was aftermarket - costed 100€
The mechanic changed it all by removing front right tire.
The old belt had still visible printings - it was 1810 (I think) mm in length
New one was 1815.
The old tensioner was loosely (the roller)
I also changed 2 rollers (original)
The new tensioner had a plastic roller where the old one had metal one. I hope I'll be fine for the next 100k km.
Still, I am concerned about the sound - I still can hear some strange noise from the belt position while in idle with hood up.
The mechanic also changed the fuel filter - after 50k km. I didn't pick it up to inspect it later home
I wonder what it looks like because i read that clogged fuel filter can cause speed limit or hard cold start bit I haven't had any trouble.
Recently I drove 170km/h for a short time, which is near the speed limit of the car (172). Actually it was 164 according to GPS. Winter tyres were on.
Now I have to change the break fluid, also clutch fluid (which I don't know where it is), and manual transmission fluid.
Also clean and maybe change the front pads which sometimes make squeaky noise when turning wheel left or right, or when I low-to-half press the break.
Changed also cabin and air filter after one year.
The air filter looked grey from both sides which worries me and I am not putting the cheap ones back in there anymore.