My understanding is that with thermostatic sandwich plates (Mocal) flow below the temp setting i.e. 180 is 90/10 meaning the flow through the sandwich to the oil cooler is 10% of max or 90% restricted. As temps climb above 180 the ratio changes and thus more oil is allowed to enter the oil cooler. I opted to scratch build my oil cooler and the process was quite easy with the help of this and Vipors DIY. Of note, I did prefill my oil cooler just prior to final intall
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