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Originally Posted by 2011BMW550i07
So how does this mod work?
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Normally as temperature increases the factory thermostat is pushed further down in the hole allowing more fluid to enter the cooler line. But some fluid always passes through holes in the thermostat itself. Our bypass plug basically removes the thermostat from the equation redirecting all oil flow through the cooler full time. Install is literally 5 minutes you can always put stock back for winter time.