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Old 01-03-2013, 02:22 PM   #10
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Join Date: Jan 2008
Location: Northern California; SF BAY
Posts: 233
My Ride: 1998 M3 / 2002 325i
Originally Posted by kaotek323i View Post
what are the advantages of the z4 diff cover?
The E46 Motorsports Finned cover is avail as a BMW Motorsports part; slightly different casting than the Z4 unit. Same effect also and avail brand new from BMW

The Higher capacity of oil compared to standard cover is nice for thermal stress as well; the cover is also heavier and stiffer/stronger (more metal)

BMW Motorsports cover (NEW):

Z4 finned cover (used)

Casting difference at bolt mounting: the required length of bolts are different!

BMW Motorsports cover

Z4 finned cover

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Last edited by wanganstyle; 01-03-2013 at 02:23 PM.
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