oil filter gen3 and gen4

I use the N1 type. Researching oil filters I have found maybe the Purolator 4976 or 4977(longer) are good USA options.
Whip City Wrencher has had some videos on oil filters. He found some have a gap where oil will leak past the filter element. I am not sure it matters, but it is not supposed to do that.

 

Perhaps I’m misinformed, but don’t all the Gen 4’s use yzzn1? For my ‘22 with frequent oil changes it is just simpler for me to use the Toyota filter and oil. Seems to me if there were better options for the car Toyota wouldn’t go through the hassle of having filters made for them or having oil companies reformulate oils for them.

 

All Gen 3's and early year Gen 4's had the permanent housing; it was just a paper cartridge that was replaced. They switched to spin-on sometime in model year 2017 IIRC.

Quote from OP with mark-up:

it seems there are 2 types of oil filter,
regular oil filter 90915yzzn1<that's the spin-on style
just the filter inside 4152yzza6<that's the paper element only, plus replacement O-ring for the permanent housing.

Gen 3's, and early Gen 4's, can be converted to spin-on style. I've done our Gen 3. There's a link in my signature on it (Spin-On...). A bit further down the page from the link are more pics, of the install. If viewing on a phone, turn it landscape to see signatures.

My reasoning for doing the conversion, and I think it's fairly common, is to reduce the complexity and possibility of errors. You can absentmindedly forget to put in a replacement filter, with the permanent housing style. Everything will go together just fine, and there's no difference in outward appearance. There also can issues with with the large O-ring that is replaced on the permanent housing barrel: it can be placed at the wrong place on the barrel, or even if correctly placed and lubed with copious oil, it can shift during install.

There was one case reported here: first time someone did an oil change themselves, after dealership service, they removed the permanent housing and found there was no filter. (they raised hell with the dealership). You can't make this mistake with a spin-on filter.

 

Thanks for that info, I appreciate it.

 

I always feel the company knows best with their teams of qualified engineers. I cut open a number of oil filters, one N1 had a bump of resin glue on the area that seals the bypass. The bump raises the bypass valve so oil will leak through. That was just in one filter.
That said I also realize from Whip City Wrencher some of the best filter companies have visible pores in the media he shows under a microscope. Mann, Baldwin, Denso, Toyota show light spots. Why is that? I come to the conclusion it doesn’t matter. They know what they make.
Looking at bypass filters, which can filter oil analytically clean, they bypass only a small amount of oil through the filter, and the rest is completely unfiltered. Yet the oil is clean.