I've had to add oil only twice. Strangely only when the car has nothing but Castrol TWS 10w60 in it. When I top off with Lubro Moly Syntech 10w60(BMW approved in Europe) the car stops consuming oil until it gets changed and filled with Castrol again. Go figure.
"what I'm driving here...is an ending." Jeremy Clarkson
2010 Carrara White Porsche Cayman 6mt
2014 Whiteout Toyota GT-86 6mt(Sold 05/23/15)
2011 Alpine White BMW M3 6mt ZCP Coupe(forced retirement 06/06/14)
2008 Alpine White BMW 328i 6mt Coupe(retired 06/21/11)