This thread here might be helpful: EU6 150 CXHA Engine Oil Change
Just done an oil change on my 150, here's a few useful pics for info.
New filter (Mann 501440619 from Carparts4less with code SCREAM100 gets it at £6.30) comes with filter and 2 O rings.
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Small O ring goes on the filter drain plug, use this to drain most of the oil out of the filter housing before removing the main body. 13mm socket.
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Main body of the filter housing comes off next, My socket is a metrinch, 31/32mm.
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Change out the filter and the O rings, there's a handy gap to get a pick under to remove the big one.
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I changed the drain plug for the Gold Plug magnetic version.
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19mm socket, tighten sump plug to 30Nm.
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I used Shell Helix Ultra Professional 0W-30 AV-L VW 507.00 and oil & filter change takes 7.4litres
The picture description of the filter change in the VW document Pages 100-101 4.29.3 is incorrect for the CXHA engine, it shows a filter that is accessed from above, while my CXHA engine is accessed from below as in the picture in Crallon's post above.
Grim
The oil viscosity recommendations keep getting lower so that the manufacturers can achieve better fuel consumption test results. There is a compromise between fuel efficiency and engine wear so you may choose to run a different oil than what VW recommends if you plan on keeping your van for a number of years or you work it hard (keep the required ACEA rating to protect the DPF and cat though).