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How many miles on the car and what styles of driving and what brand/type of oil was used and what were the oil change intervals?
Flushing cleans some of the crap/scum/oxidized coating left behind by petroleum oil and by the normal combustion process. Not 100% required and synthetic oil will start to clean this stuff, but as it's cleaned, some of the crud will be combusted along with some of your oil....in a particularly dirty engine this oil consumption can be high for awhile then it drops off.
Flushing your crankcase will help get through this consumption period faster...by "precleaning" the engine for change over.
For high miler engines read this (I know this may be way overboard for a "newer" 850, but you can take out of it what you want):
http://www.fidalgo.net/~brook4/ENGINE_FLUSH.html
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