Link or any supporting document?
Originally Posted by bimmerdiesel
Its not only top off. BMW also follows similar rule. They drain and refill on alternate oil changes. So under free warranty you will be entitled to 2 drain-refill
Updated SIB160109 does not require purge of DEF anymore and don't see any reason why BMW dealers would do otherwise unless some other condition requires it.
2010 335d e90
300, LCAD, ZPP, ZSP, 2XA, 302, 465, 494, 4B9, 609, 655, 677, 6FL, 6NF