RE: Low oil pressure

[tr6taylor@webtv.net (Sally or Dick Taylor)]

Marko---The oil bi-pass that's built into most filters works differently
than the oil bi-pass valve that's screwed into the block. A clogged
filter will cause its internal spring to open, enough to where some
unfitered oil will pass thru to the engine.
The bi-pass valve on the block can open at high pressure, regardless of
whether the filter is plugged, or not.  Both have a somewhat different
role.

Dick