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Old 02-19-2004, 03:05 PM   #9
Jon [in CT]
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Join Date: Nov 2000
Chapter/Region: NESIC
Location: Connecticut, USA
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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.
So why wouldn't a filter with 43% more filtration surface area also be good for an EJ20, like it is for the EZ30?
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