Re: Block filter bypass valve
Pros: 100% filtered oil all the time
Cons: If for ANY reason the filter fails or gets plugged, you have NO oil AT ALL.
The relief valve opens on a pressure differential. It only opens when the filter is clogged and becomes a restriction. This is an obvious benefit for those who never bother to change their oil & filter. If you stay on top of oil & filter changes you should never have a problem.
That said, in the event of some sort of fluke filter failure, personally I'd rather have unfiltered oil circulating through the engine than none at all.
I don't block mine, FWIW.
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