Thanks!
There wasn´t to much progress so far.
I replaced mishimoto racing thermostat for OEM (it was broken or opened really to fast).
Now, water temp is quickly on 90°C and holds.
But there is problem with oil temperature still.
On average day, I drive 30km to work and 30 back. Oil temp goes to 80°C after 15km. Even with longer drives, it is never on 100°C.
Previous owner installed 34 row Z1 oil cooler with thermostatic sandwich plate. I don´t know if thermostat still works or its permanently open. Also I think for 20°-25°C average temperatures here in May and for 90% daily comuting, oil cooler is too big.
So here is the question:
Should I use some sort of shield infront of oil cooler, or change it for smaller one (I found 10 and 13 row) or delete it permanently?
Temperatures during summer are 25-35°C.
I found manual how to repair trunk latch here on forum (little springs on both sides of trunk), and I am happy to say, it worked really well!
so I can finally open my trunk normally
Adding photo of oil cooler.