I'm monitoring my oil consumption at the moment Paul after tweaking the oil feed. I had quite a bit of oil flowing through the CHRA, which was contributing to a fair bit if windage.
I've got to pull the turbo as the oil return gasket is seeping from the CHRA and the link hose isn't flouro lined, which is a no-no. I've got a good 50mls in my drip tray, so that's something I'd like to rectify before I can get a meaningful figure on general consumption but it's nowhere near 1L per 260miles.
I'm gonna need to reapply alot more teflon tap to my oil return adapter to try stop this seeping leak. the garage floor yet again oily with drips from turbo.
I believe the 1L/260mile is mostly due to the forged piston engine rings/bores drinking oil.
during idle she no longer smokes oil but she does still smoke after long downhill coasting.