thanks Sussexa, your a fountain of knowledge, and have made me understand the whole catch can mounting points

heres a thread off alfaforum related and theres a few pics of other cars set ups and size of tanks.
http://www.alfaowner.com/Forum/tuning-and-upgrades/440649-oil-catch-can.html
http://www.alfaowner.com/Forum/alfa-159-brera-and-946-spider/349098-oil-catch-can.html
http://www.alfaowner.com/Forum/tuning-and-upgrades/314879-alfa-156-2-4-jtd-project-250bhp-3.html
a few things to remember if you fit one
go for pipe fittings as close to the original hose size (don't buy one with really small fittings or pipes as it will be restrictive like 9mm etc more like 15-19mm required.)
if you fit baffles or stainless wool don't let anything be sucked out and into engine
make sure theres room for it and to get to it to drain or remove to drain periodically, I think the 0.5l tanks would be plenty big enough.
check it regularly at first and then see how you go for it getting dirty or filling up( I might of done a week, month, 6 months )
I bought a load of cheap carb cleaner and its ideal to spray inside tank(with lid off) and clean fittings, swill out crap and let dry, reassemble.
theres a really expensive tank for trucks called provent or something like that, its really small physically but must work well considering size of vehicles its fitted to.
http://www.ebay.com.au/itm/PRO-VENT...DE-IN-GERMANY-THE-ORIGINAL-BEST-/251255696154
gives an idea of where in the breather line it fits
not many people bother with the return to sump line on the bottom, just drain regular.
im sure ive seen someone copy the basic design of this in an ally tank made up, might have been in one of those alfa links
might be this one
http://www.alfaowner.com/Forum/tuni...ra-2-4-skunk-works-thread-20.html#post5088787
http://www.alfaowner.com/Forum/tuni...rogress-thread-formally-2-4-20v-p-box-56.html

not sure if ive linkd to this already yet
http://www.alfaowner.com/Forum/alfa...-line-mini-oil-catch-tank-rutland-motors.html
shows some good details of alfa boys fitting rutland motors catch tank.
it looks a nice small unit , much easier to fit in the engine bay than the normal ebay tanks.
check with supplier regarding the filter media, I think the latest version was sintered bronze type filter.
also measure your original breather pipes and pick fitting size as close to it.
and lastly someone had trouble with orings on drain valve, might be worth asking if they could supply a few spares?
also bare in mind those guys are probably jtdm cars with a separator at the back of engine same as mine , so oil theyre measuring is small , but its also bypassed the std alfa separator and would have ended up in the turbo/intercooler/inlet manifold sooner or later.

interesting read that, thanks sussexa

Hello! Who knows with what solution(carb cleaner,gasoline,etc.) i can clean the oil separator(number 5 in the attachment)? If it's possible to do that. Thanks!

1.take it off the car
2. spray oven cleaner( Sano, Triumf,..) in both ends ..let soak or 5-10 minutes
3. rinse with hot water
4. repeat steps 1-3 until you no longer see any crap coming out(at least 5-6 times)

Before putting it back on the car make sure you rinse it enough to make sure none of the oven cleaner will go inside the engine.

Ok,thanks! I was afraid not to damage something inside.Thanks again!