For H-6 motor they have an oil filter PN different than the H-4's. Everything about the filter is the same size wise, the bypass still opens up at 23 psi, but the filter material surface area for the H-6 is 201 sq/in VS 141 sq/in. for the H-4 filter.
PN for the H-4 = 15208AA060
PN for the H-6 = SOA5165109
I don't know if there is a price difference but it would seem that the H-6 filter might be a good to use on the H-4 too.
I don't believe build quality is an issue for filters. Unless you don't change your filter with every oil change (~3000 miles) it isn't that big of a difference. Yeah, micron filtration, the way it looks, how many sq. inches of pleated surface, it all matters. But there are so many more variables in the oil itself also.
Now granted this did come from a Subaru dealer, but I've heard that "cheap" filters (FRAM, STP, etc.) have been known to literally explode (or maybe burst is a better term) on Subarus due to the higher oil pressure Subarus run.
I've used primarily Subaru oil filters but currently have a Bosch installed. (I've read too many bad reviews of FRAM oil filter build quality to ever use them again.)
Anyways, I've been using Fram filters on every 4 cylinder car I've owned since 1978 and have NEVER had a problem. Depending on how much I liked the car the oil was changed every 3k-7k miles.
Currently I primarily use AC Delco on my RS but I can recall using a Fram 2-4 times if I couldn't find a Delco and have never had a problem.
IMO, if the application guide says it fit, it OK in my book, just change the oil routinely:flame:
personally i like the k&n filters. they have a heavy duty valve in them and if youv'e tightened it down too much it has a 1" hex on the bottom so you can use a socket wrench rather than a filter wrench, or in some cases you won't have to stab it with a screw driver.
The auto parts store I went to didnt have Bosch, so I'm going to use Purolator if it ever stops raining and I can get my ass outside. I think my car has replaced my wife I spend more time and money on my car now than her, lol