Benefits of the NRW Design Valve Cover:

1. Aluminum is not microporous and will not oxidize or corrode. 
2. Aluminum is a proven material for valve covers used by many manufactures across many different models for        decades.  In fact, the BMW S85 V10 valve covers are aluminum. (And do not leak)
3. 1:1 design means the NRW Design valve covers is an identical copy of the original S65 valve cover.  All ancillary parts like gaskets, bolts, oil cap, cam sensors, plug tubes, oil separators, and coil packs work just like the original. 
4. Powder coated with choice of colors and finishes 
5. Cheaper than the original BMW valve covers 
6. Lifetime warranty!