Quote:
Originally Posted by roy'sz
I wouldn't necessarily call it the bypass. Part of the oil goes through the filter and back to your engine. Not all of the flow is designed to go throug the cooler. After it flows to the cooler it comes back through the filter and to the Engine. Other than that yeah that's pretty accurate.
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It's a bypass for the path through the cooler. When fully hot, all flow goes through the cooler (well, within mechanical limits, obviously there's no perfect seal on the valve).
Regardless of the bypass valve's position (regardless of temperature), all fluid goes through the filter (although the filter itself will also have a bypass that makes it practically useless at high flow rates).