karls59tr said:
Just found out that these filters should have an internal release valve. What could happen to oil pressure if a generic oil filter without such a valve was to be used?
A generic filter would have such a valve typically.
If you run a filter without such a valve, and the filter media becomes blocked because you never change the filter, or you are running an extremely high viscosity oil, the oil will not go through the filter media. So no oil will be going to the bearings, and the engine will burn up.
If the filter is physically strong, the oil pump pressure relief valve is set low enough, the oil will just dump there. Otherwise the filter itself may collapse. Generally not good for the engine, but at least oil will likely flow to the bearings.
All of which is a moot point. Filters don't block unless you leave it there for many 10's of thousands of miles.
The bypass is usefull for high viscosity oils in cold engines. A combination you shouldn't be running anyhow.