Recently got one of these

http://www.saikoumichi.com/951_page.htm

but also found this as an alternative, similar spec and price

http://store.42draftdesigns.com/Stealth-Oil-Catch-Can_p_289.html

they also do this one, but price is a little scary

http://store.42draftdesigns.com/Ultimate-Oil-Catch-Can_p_288.html

HTH

The saikou michi the best design out of those imo

How would a catch can work on a diesel? Does the turbo need the oil vapors coming from the air intake to work properly?

How would a catch can work on a diesel? Does the turbo need the oil vapors coming from the air intake to work properly?

How would a catch can work on a diesel?

The same as on a petrol

Does the turbo need the oil vapors coming from the air intake to work properly?

No. The turbo has a pressurised oil bearing and has it's own oil feed/return.

to be fair they mainly seem to collect condensation, I've still got gunk in my boost pipes with mine fitted.