[Ex-Calif]

The filter can also bypass under certain cold weather conditions. Viscosity is high and in order to allow it to circulate while warming up the filter may bypass for a short while.

As others have posted, the engine manual should spec the operating oil pressure range or spec the bypass pressure.

You do not want oil bypassing lower than upper operating range.

Example if the oil pressure range is 10-30 psi you would ideally like a 30 psi bypass. You definitely don't want 8 psi bypass.

I am sure most engines have the bypass valve integrated into the head of the filter housing and is set at overhaul of the engine. This would seem the most common way to do it.