I don't know, it was just a theory as those LPG adaptors cought my eye. I guess it could be just oil rings that are worn and compression rings still fine.
Oil consumption only on low revs is interesting, isn't it usually the other way round that oil consumption goes up with revs? 
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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