One month ago, I also threw a rod. It was rod #2 I think they told me. I changed my oil religously, and had the records to prove it - which comes to the second part of my story.

My warranty company fullfilled their obligation, only half assed (this is the carmax extended warranty). They gave the Isuzu dealership some awful shortblock to replace my blown one. To make a long story short, as I've been in a battle over this new P.O.S block I decided to approach the tech that did the rebuild, and he said the following -

"I've tried to complain to Isuzu that there's not enough oil getting to those two back cylinders"

He went into more detail about the process and that this seems to be an inherit problem with the 3.5L's from Isuzu... But I forgot the rest...

just some interesting bit of info.

I saw where Dallas commented about this topic coming up in the past, but I never saw the discussion so not sure if I'm just restating old info or not.. :P