Quote:
Originally Posted by mdputnam
For folks who are shopping you might include a mention of the Performance Engine Option that was offered through 2012. It included more horsepower and dual radiators, basically the 1M engine in a plain Jane 135i. It is important to note that the engine maintenance schedule is different than a stock N55. We don't want anyone accidentally screwing up the maintenance on one of these rare beasts.
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The "Performance Engine Option" you are referring to is officially known of the PPK2 (Power performance kit 2). This comes standard on the 135is and includes the PPK1 software as well as the aux radiator, larger fan, and maybe a couple other things I am missing. Maintenance schedule is different and BMW has included a warning/reminder in the form of a sticker placed in the engine bay.