there was a DCCD guide on here somewhere about using it.
Pretty much -
Dry tarseal/daily use - Open
Dry- agressive use - 1-2 clicks foward
Wet - 1-2 clicks foward
Wet agressive - 3-4 clicks foward
Thrashing car/Gravel/Snow etc etc - all way foward and hang on.
This is only a guide, and wont be bad if you use outside of this. Just make sure its open for the long distance cruises, and dont wrap it around a tree when running around in full open.
If your really worried, you can get DCCD controllers that can set it automatically.
If tyres are not exactly same brand/pressure/worn-ness - the diff can bang and thump, even in a straight line, and makes steering heavy.
Turning corners on dry tar with think in lock makes one helluva noise.
You know its bad when even the subaru manual mentions that making noises is normal.
Also - could those who dont have DCCD, have never had DCCD, and possibly never been in a DCCD car, please refrain from spouting sheit about stuff they dont know about/unrelated crap?