I run Fram Ultra Synthetic high capacity filters designed to have enough room inside the filter to hold particles for 20,000 mile oil changes.
My oil change interval is only 4,000 miles.
So I doubt one of my filters would ever go into bypass. The synthetic media provides high flow + high filtration, so you get the best of both worlds.
Having the cleanest possible oil is always best for the engine.
If you are using garbage filters with low efficiency, imagine all those extra particles in your oil that can potentially wear down the bearings when the oil with those extra particles is getting in between your moving parts. This is exaserbated if you are using a 20 weight or thinner oil, where film thickness is less, and particles in the oil in between bearing metal surfaces during high RPM situations can really cause wear.
Question about filter bypass.
Would it be a true statement that canister filters with a bypass, will generally go into bypass right after a cold start?