Can't hurt. Could help.
Get the proper multi-stage style, like BMS's.
Pair it up with a sturdier PCV valve body from Rob Beck (RB) and you've got a good (if not complete) blowby insurance plan.
2013 335is DCT
-- Quaife | JRZ RS1 - 450/800# | M3 + Hardrace arms | e93 M3 + Hotchkis f/r sways | BMS CP + OCC | ETS 5" IC | AFE DP's + DCI | RB PCV + Thermo Delete | Setrab + Improved Racing oil cooling | Stoptech f+r BBK | Cobb BQ Tune