To Price: Honestly, I haven't noticed any change in mileage after the CBU cleaning. As mentioned on the thermostat thread, I did get a nice improvement in mpg after installing a new thermostat. But nothing that I noticed after the CBU buildup.

To Split71: I would say not really. I have been able to go the roughly 11,000 miles or so between oil changes without having to add any. Though by the time 11,000 miles or so is up I seem to be down about a quart.

Regards.

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Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife