Originally Posted by raceyBMW
If you did that, it would still retain the stock OC thermostat (which is built into the OEM front plate oil filter housing) and adding the other inline thermostat would be kind of silly. This would mean you have the factory one that opens at ~240°F-250°F and then oil would go downstream to the Stett 180° thermostat and already be hot. They way they did it is the correct way.
Ahaaa! I got it now! I was not sure where the OEM oil thermostat is located at. It is clear to me that STETT did things correctly now.
Yeah, I would be very interested in seeing an aftermarket oil filter cover with 180-200 degree thermostat.