My 2 cents; I did some preliminary research prior to this thread on some of the topics touched and here are my observations:
Oil: Per GM the 2.8 should only be fed oil that meeds the DEXOS2 or in a bind the ACEA C3 specification and so far the only non GM oil I can find that meets that criteria is
Mobil1 5-30 ESP. I'm sure the Delvec and Rotella products will work but while I have an engine and DPF under warranty will be playing it safe.
My first personally done oil change will be with the Mobil1 ESP product
As for the oil catch can; I read that most any one that had a baffle in it was best and the apparent inlet size for Colorado *should* be 19mm 3/4". You can pay anywhere from $25 (ePay) - to $300 or more but from the videos I've seen just go with the ePay China stuff since this is a passive trap device and no real difference exists between a really expensive or a cheaper one except for possibly some vehicle specific mounting brackets and hose kits (which can add up) . There is a lot of
informative web information/videos on them. As for need? I'm not so sure the turbo doesn't benefit from a little oil else the factory would have provided the trap like they do for fuel filters. I imagine the need would be if you have a lot of oil from a worn engine or are using a non-low ash oil that will make it to the DPF.
Just for grins I have
ordered a oil trap from China for evaluation - but don't expect me to do anything with it for a while since it will need a custom bracket and hoses - and a lot of incentive on my part.