Excessive oil consumption isn't normal
Automakers say adding oil between scheduled changes is acceptable. It's not.
http://www.consumerreports.org/cro/magazine/2015/06/excessive-oil-consumption/index.htm
Newer Audi, BMW, Subaru models use lots of oil, Consumer Reports survey finds
http://www.autonews.com/article/20150630/RETAIL05/150639990/newer-audi-bmw-subaru-models-use-lots-of-oil-consumer-reports-survey