Tom

I changed my oil in my 2006 Sonata and used a Bosch OEM filter I bought over
the internet from a Hyundai dealer. It doesn't have the valve in the bottom
of the filter like the Hyundai filter did that I removed. An earlier post
said the valve kept the oil from draining out of the filter and causing loss
of oil to valve train on startup. I'm confused by this explanation since
the filter sits vertically on the engine and there is no way that the oil is
going to drain out of it.
The valve might be a bypass valve if the filter gets clogged, which is
usually what is in some filters.
Any comments?

Tom