John Horner wrote:
B A R R Y wrote:
John Horner wrote:

It is called an anti-drainback valve and most oil filter incorporate
one. Without it your engine would take longer to build oil pressure
at start up, which is a bad thing.


The valve is not present in the correct Toyota oil filter.


Not according to Toyota!

"An anti-drainback valve, which prevents oil from draining out of the
engine and into the oil pan, helping to protect your engine from
increased wear during cold starts."

I always change my own oil. I always use the Toyota OEM filter
specifically listed for my 2005 Tacoma. The filter is mounted gasket
down, on _top_ of the engine (the highest point in the oil system). I
drive the truck on the ramps, drop the drain plug, and by the time I
get back to the filter, there's nothing left in it but a few drops.

Frank's aftermarket filter is still full, on the same engine.

Interpret that however you wish. G