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      01-29-2013, 05:13 PM   #2
Pete C
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Drives: '08 Z4 SI
Join Date: Nov 2012
Location: Colorado

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For the 3.0Si the stock oil cooler is really a heat exchanger located next to the oil filter cap. It uses engine coolant to stabilize the oil temperature and aids in cold oil warm-up. BMW's in general usually have high oil temps in competition driving. Long hill climbs being one of the worst as there's less cooling air flow. I wouldn't worry about short track auto-Xing but an oil temperature gauge would be nice like on the old Z3 M coupes.

Con-rod bearing stress goes up with the square of rpm so I only briefly visit redline

Last edited by Pete C; 01-29-2013 at 05:15 PM. Reason: 3.0Si reference