Doc here's a pic of the oil filter Wix 51515 i used.. changed it at 5,250 kms
gasket
nitrile rubber
bypass valve
head
filter media, 45 pleats...
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Looks like your anti-drain back valve has a tear in it. Did that happen taking it off?
yeah, i accidentally tore it off when removing it from the housing.. haha
Your really killing yourself on short oil change intervals, the WIX filter is good on just about any gas engine for around 12000km. And as far as oil goes if your using CH-4/SL or CI-4/SL Rated oils then there is abolutely no reason to be changing it till around 10000km to 12000km and that's the dyno stuff. If you use a synthetic (Group III and up) 12000km is what you should look for.
CH-4/SL or CI-4/SL oils will have a high TBN that will still be perfectly good at that oil change interval and still have plenty of the additive package left in it. Now if your using low end SL or SM oil that's a different story.
With the proven source of availible engine oil anylisis you can look up you can clearly see there is no reason to run your oil or filter for such short durations. Changing oil based off of common schools of though are just not accurate.
WIX is a higher end filter so feel good with going 12000km with it.
Update
Bf7534 still out of stock * volmax, went there today to get 2 pcs of bd28
Just installed BF7535 over the weekend, doing good so far...this is indeed the direct replacement of 1770A053 as per all the cross-referencing done, even using the Denso P/N at times. Even checked and measured the thread pitch. BF7534 can fit but do not know how tight it can really hold...