danbennett2u Posted September 20, 2011 Share Posted September 20, 2011 I use supertech oil filters because of the quality vs price ratio. I know black OEM is the best but I dont want to spend more than double what I pay for the ST filters. I see some people online say ST6607 whereas ST3593a is what comes up when I do a application search. I have been using the st3593a for years. The ST6607 looks a little higher quality but is smaller. I cant find specs on either to compare. Anyone know if the bypass spec is the same on these? Any reason to use one over the other? Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted September 21, 2011 Share Posted September 21, 2011 Here's some info regarding the smaller vs. larger oil filters. http://ultimatesubaru.org/forum/showthread.php?t=126302 Quote Link to comment Share on other sites More sharing options...
Rooster2 Posted September 21, 2011 Share Posted September 21, 2011 I don't think anyone on this forum is going to know the answer regarding oil filter bypass specs. Prolly only the manufacturer knows that. I use, and have used for years the Walmart brand supertech filters. I have always used the 3593 size in my Subie with no problems. I see no reason to switch to another size. Quote Link to comment Share on other sites More sharing options...
the3rsss Posted September 23, 2011 Share Posted September 23, 2011 I know that purolator is the only filter with a high bypass number 20-25 lbs. But they have no anti drainback valve. Six has the valve bit low bypass numbers 8. I went with stock. Quote Link to comment Share on other sites More sharing options...
the3rsss Posted September 23, 2011 Share Posted September 23, 2011 Wix Quote Link to comment Share on other sites More sharing options...
Legacy777 Posted September 23, 2011 Share Posted September 23, 2011 For most Subaru motors the anti-drain back valve is not necessary since the filter sits vertically with the base or "bowl" downward. Quote Link to comment Share on other sites More sharing options...
the3rsss Posted September 23, 2011 Share Posted September 23, 2011 Wow. That's a damn good point josh. Oil can't drain up! Might go with purolator filters . Pure one is a quality filter that has stock bypass pressure. Quote Link to comment Share on other sites More sharing options...
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