The most important part of this is the built in Thermostat. This allows for quick engine warm up and maintains a safe oil pressure upon startup. Without using a thermostat, some oil coolers take a while to fill up and build pressure giving longer duration to get proper oil circulation within the motor. The thermostat open temperature ranges from 71deg~85deg Celcius.

----VERY IMPORTANT: When selecting M20x1.5, you have to use a 3/4x16unf filter. The Female side going to the block will be M20x1.5, but the male side going to the filter will be 3/4x16UNF