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[epapp]

So the stock filter housing allows an amount of unfiltered oil to circulate always? Or only once the sprung bypass is loaded with a certain amount of oil pressure?

[Jake Raby]

Originally Posted by epapp

So the stock filter housing allows an amount of unfiltered oil to circulate always? Or only once the sprung bypass is loaded with a certain amount of oil pressure?

And after the relief spring sees thousands of thermal cycles and becomes weak.. Or after its a decade old.

The filter thats used and how clean that filter is also increases the loads that the bypass sees.. Thats why long service intervals that are recommended by the factory suck so bad, the dirtier the filter, the more oil is bypassed. Some cars will see some bypass oil at all times because of variables like these.

When a failure occurs the filter does it's job well, until the pressure within the filter housing is elevated due to a partially blocked filter, and the bypass opens. Its at that moment when the main and rod bearings see collateral damage from debris suspended in the oil. Its pressure fed death.