It's been difficult finding a really good oil filter for my car since Subaru engineers are a bunch of weirdos, and I'm kind of a perfectionist. My car has a very high flow oil pump and specs a small filter with a bypass rating of 23 psi. I'm currently using an oversized Baldwin filter with a bypass rating of 20psi. The Baldwin is probably better than stock in terms of not going into bypass as easily (due to the large size), but it's not very efficient, 99% at 40 micron. This is probably a lot worse than the OEM filter, which is either a Fram Extraguard or Toughguard (not sure).
I'm looking for a filter that will not bypass much more easily than stock, but also has high efficiency. I like the Fram Ultra, but its bypass rating in any compatible filter is only 12 psi, and there are no filters in a M20x1.5 thread size that are much larger than stock (less restriction to compensate for the lower bypass rating). I've found the perfect filter, though, a FRAM XG10575. It's got 45% more filter volume than stock, a 22psi bypass, and 20 micron absolute efficiency. Perfect. I'm in love. I don't even care that it's a bit too tall, since the Baldwin has already burned a hole through my hood insulation. The real problem is that my M20x1.5 male nub is too small for her M22x1.5 female opening. Are there any M20 to M22 adapters I could use to accommodate an M22x1.5 filter?
I'm looking for a filter that will not bypass much more easily than stock, but also has high efficiency. I like the Fram Ultra, but its bypass rating in any compatible filter is only 12 psi, and there are no filters in a M20x1.5 thread size that are much larger than stock (less restriction to compensate for the lower bypass rating). I've found the perfect filter, though, a FRAM XG10575. It's got 45% more filter volume than stock, a 22psi bypass, and 20 micron absolute efficiency. Perfect. I'm in love. I don't even care that it's a bit too tall, since the Baldwin has already burned a hole through my hood insulation. The real problem is that my M20x1.5 male nub is too small for her M22x1.5 female opening. Are there any M20 to M22 adapters I could use to accommodate an M22x1.5 filter?
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