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      01-29-2013, 03:45 PM   #1
Incompatible
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Drives: 07 AW Z4C 3.0Si
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Additional Oil Cooling for 3.0Si Cars?

I've been following the thread on bearing wear and those that track their Z4M with interest. There appears to be a general consensus that additional oil cooling, typically with a larger cooler, significantly extends bearing life. It's even suggested that those who only autox would benefit.

I looked through realoem and found a listing and diagram for what appears to be a small external oil cooler on our cars. After looking at my car I can't find it.

Question 1: Would this be something beneficial to owners of Si models? Particularly those who autox or track their cars in the warmer parts of the country?
Question 2: If we already have an external oil cooler, how hard would it be to re-route the lines and install a larger cooler?
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      01-29-2013, 04:13 PM   #2
Pete C
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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 04:15 PM. Reason: 3.0Si reference
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      01-30-2013, 09:53 AM   #3
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I was definitely looking in the wrong place, thanks for the location. An oil temp gauge sounds like a good place to start. I had considered a gauge set in the past and somehow got sidetracked, looks like another project. Thanks again.
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