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.
'02 330Ci - Megasquirt 3 tuned by PFTuning.com, M50 manifold, Kromer Kraft headers, Motons, widebody, etc.