Quote:
Originally Posted by Kostamojen
Why these weren't included from the factory, is beyond me...
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I apologize if my previous post was too long or too technical and was thus skipped over by many people. The reason why it wasn't included was that the oil temperatures simply do not get high enough for what they expected severe driving to be for most customers. Anything under 270F definitely isn't going to harm anything, although it's not ideal.
The determination of whether it needs an oil cooler is evaluated on an engine dyno, not in a vehicle driving on a track. The reason why it's done on an engine dyno with a guesstimate of speed & load is because by the time you have prototypes driving around, it's too late to make such a decision about hardware. Manufacturing tooling is frozen long before you can get a representative vehicle driving around to see how high the temps actually get.
Also, it's much easier to install good instrumentation in a lab to calculate the heat transfer from the oil and coolant circuits. These heat rejection calculations, measured in kilowatts from mass flow and temperature change of the fluid, are used for sizing of coolers. And they're done way before anyone ever drives the car around in the real world.