Quote:
Originally Posted by e30lover318i
I also have a 12, I read about the later model n55 having updated rod bearings I guess we got screwed. Whats your theory on your rod bearing failure? Previous owner poor maintenance?
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Yeah, I've read that the RBs were a problem in the early N55s. (I think I've even read weaker than the N54's.) It could have been the 3 previous owner's bad maintenance (1 was a lease). I don't like to push past 7.5-10K on oil, no matter what the computer says, so she was cared for under my watch.
In the X3, I don't tend to redline, as that is my daily and long haul car. (I have an 07 E93 that is slightly tuned for top down quick/fast fun.) So when she seized, it was one of the few times (<20) I actually pushed it that hard. Most miles were highway and a few slightly spirited runs off of a red light, so I lean towards bad design/weak or cheap parts.
The new LB has upgraded bearings over stock, so it won't be a problem in the next 108K or beyond.
