They have OPN issues when people over-rev them.
Originally Posted by TerraPhantm
S52 was an iron block and plenty of them have the OPN issue. Same crank as the M54B30. I don't think aluminum is the problem.
'03 330i ZHP - Stock-ish
'02 330Ci - Megasquirted, E85'd and tuned by PFTuning.com