OK. The OEM filter has an anti-drainback device installed to retain oil for startup. I was curious to see what was in the Pure Ones, so I took a couple apart. They were the 14459 and 14622 models.

The boxes for both say the same thing on the box: 'Silicone Anti-Drainback Valve'



What each filter shares in common is the outer housing (doh), filter, retaining clip to press between top of housing and filter, and red gasket that filter sits on inside housing.

14622 top and retaining clip


14622 bottom, looking inside


14459 top and retaining clip


14459 bottom, looking inside, "silicone retaining ring" bottom of interior anti-drainback valve, and stupid retaining clip again.


The valve mentioned on the box is the red ring/gasket visible in the 14459 bottom picture. What the OEM filter has, and the 14459 also, is an interior spring valve, located at the top of the filter core. Note that the 14459 has a cardboard top of that anti-drainback valve, located in the top picture, where the 14622 just has a funky swirl of metal at the top (to collect metal particles?)

In my opinion, the valid anti-drainback device is the spring valve located in the top of the filter. This is what the OEM filter has, this is what the 14459 has. The 14622 does not have this.

Anyways, my conclusion is use an OEM, or the 14459 if it will fit on your engine.
The 14459 is larger, and might not fit depending on engine mods (ASP or Greddy elbows), as noted in the OEM filter thread.

 

The 14622 is the one used for the KL 2.5L V6 Mazda engines, correct? I've been using this filter for almost two years now with no ill effects. Perhaps the metal "swirl" is thermally activated, meaning it opens/closes depending on oil temps.

Please don't take this as a flame, but I'd need a more valid opinion on what the metal swirl is for and why it isn't as good as the versions used in the OEM and the 14459. The swirl may also provide less restriction than a spring-actuated anti-drainback?

 

The box says the anti drain valve is on the bottom so why do you think it's on the top of the filter?

How could a valve be on the top if it's supposed to retain oil inside the filter? Oil flows in/out of the filter thru the bottom.

Here is a good way to test the valve. Fill up the filter will oil before you install it. Let the oil soak into the element. Turn the filter upside down with the opening to the bottom. No oil coming out so yes, it's got the valve.

 

Because the valve works through suction and vacuum.

 

nice work PV.

the anti drain valve is the flat gasket at bottom (red on pure-1). it's seen thru the ring of small holes at the bottom mounting surface. poke with toothpick and it flexes up. My L14620 has a black one.

It only prevents oil about to enter the filter (thru the outer holes) from draining back into the sump thrru coolers and pump. It doesn't prevent all the oil in the filter from slowly draining thru the central discharge path.

 

so what filter should we use? just the OEM?

 

I would say use the OEM, or use the 14459.

 

Allright. I did more research. I was indeed looking into the swirl on top of the 14622

Top 14622



Bottom 14622



Top 14459



I used a pliers to twist the crap out of the swirl. I was able to bend it up, not easily mind you. It turns out the swirl, through the rivet in the middle, keeps a small circular piece flush with the top of the filter. As someone has mentioned, this might be a thermocouple which expands and contracts. The force needed to push it manually is at least an order of magnitude above that of the 14459.

If you posit that both the 14622 and 14459 are using thermocouples, then the 14459 (and the OEM) have the benefit of guides for the thermocouple to use when it expands, whereas the 14622 does not.

 

the spring at the top of the element is most likely the bypass valve. If the filter was to get clogged that spring would allow the element to lift off of it's seat and allow the oil to bypass the element, rather than impede oil flow, and kill the engine. The silicone flap is the antidrainback valve.