Since someone has brought up Subaru oil filters again, I noticed a little blurb on p. 3 of this
SOA article:
Quote:
Oil Filters: H-4 Versus H-6 Engines
Subaru H-4 engines come from the factory with an OEM P/N 15208AA060 oil filter. The same part number is used for replacement. H-6 engines come with an OEM P/N 15208AA031, and S0A5165109 is used as a replacement.
Both filters have the same physical dimensions as far as threads, O-ring, and bypass valve opening pressure (23 p.s.i.) are concerned. However, the H-4 filter has 141 square inches of filtration surface, while the H-6 filter has 201 square inches of filtration surface.
The H-4 filter should not be used on the H-6 engine. Using the H-4 filter may cause it to become contaminated faster and allow the bypass valve to open, allowing unfiltered oil to circulate through the engine.
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So why wouldn't a filter with 43% more filtration surface area also be good for an EJ20, like it is for the EZ30?