It is well known throughout the BMW world of the S54 engine fitted to the E46 M3 and Z3/Z4M models having rod bearing failures, With a recall from BMW in the early years of the production run this did not make the issue disappear or become a life time repair.
As with any engine bearing failure this can lead to catastrophic engine failure especially with and spirited driving or track use.
We offer replacement and upgrades with some options.
ACL Bearing Kit *Recommended* or Genuine BMW.
ARP rod bolt kit *Recommended* or Genuine BMW.
Oil Pan Strainer gasket.