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IMHO guys like to obsess over oil and filters, and many of them think they are doing their engines such a huuuuge favor by changing oil and filters at premature and excessive intervals.
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Frank, I'm totally with you as far as engine oil is concerned. I run 10K+ mile service intervals on ye olde dino oil.
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I can tell you from experience, because my company sells almost all of the filter makers the filter paper that they pleat and put in these filters, there is a difference in filters.
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Funny, I'm also with you - no doubt the materials and construction makes a big difference in the filter.... The root question is, however, does that difference in filter make a difference with respect to the engine. I'll leave that as a rhetorical question...
I too buy the cheapo filters - but I also send used oil samples to blackstone for analysis (my choice is super short service intervals or, for the same price, oil analysis with longer intervals)... To date, I haven't gotten any ill reports about excessive solids, silica, etc. etc. in my oil (other than copper - but that's another story with '00 2.0 Jetta gassers). Perhaps it's causality, but I'm confident that the cheap filters I'm using are doing their job as a filter.