So is there a requirement to drain the turbos of oil??
Any DIY I've seen (and any reference to shop manual I've read) has included that.
I believe that if it has a drain plug and there is access, one should use it. It is a source of burned engine oil that I would think should be changed out. Also you can monitor the health of the bearings during the draining of the turbos. I recently purchased a set of Magnet tipped turbocharger drain plugs on ebay...
Does anyone have a diagram showing where the turbo drain plugs are located? Any help would be appreciated.