Quote:
Originally Posted by DrinkenBRZ
KillerB was who reported the oil temp delta.
I’m in ZDan’s camp. There is no compelling reason for the oil cooler on the Gen 1. Plenty of OEMs and oil manufacturers have no or minimal issues bringing oil to 270F if not 320F as do race teams. Increase the viscosity appropriately and change it more often and all will be well.
My E9X M3s would routinely hit 270-280F on track with a cooler and BMW Motorsports response was use correct 10w60 oil and don’t pay it another thought.
My F8X M3s rarely hit 240, but they were spec’d 0w40 and later 0w30 and had the cooling to support that spec.
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Are you really getting at the "lesser of two evils" principle?
If weighing a higher viscosity oil against using an oil cooler then it seems that the choice is the lesser of two evils which would be higher viscosity oil since an added oil cooler is just more mechanical complexity which could lead to other failures and complications.
I guess it's a question of to each his own then.