I'm not really sure what is "bingo" in that thread, I read it all the way through and did not see where " a few people contacted WIX and were told that the XP synthetic filter doesn't filter very well", I saw one poster where he said that he had a phone conversation. Yet no numbers were given, so my original question still stands as to how a comparison is being made to the German filters. If no numbers are given on either side how do you know anything about any of the filters?
This isn't a "support Wix" thread nor comment. You probably won't believe me but as far as I know I've never used a Wix filter on any of my cars. It has always been OEM for the most part, except for when something "better" is on sale such as when M1 filters were available for $3.99 at Farm & Fleet. So don't take my comments as being in support of Wix.
It's just another case of comparisons being made and conclusions drawn with no data (IMO). The OP's original question was "I've been looking around to see if there's anything superior to the OEM BMW filters" and so far I haven't seen any way to make that determination.
It might not have been your intention at all to come off as aggressive, but I very clearly said "I guess" when I was talking about the filtering ability of the OEM filter competed to regular WIX compared to WIX XP. Then you asked for proof of something that I said I was guessing. No hard feelings if you just didn't mean to come off that way. There was
quite a bit of info in that WIX XP thread, but I don't know how much of it is true. I doubt the people were lying, though.
In the end, I'm pretty comfortable with the OEM filters. A better filter for ~$10-$15, depending on how much better it is, would be nice, though.
Why not run the Hengst for 10k? I do in my wagon, two OCIs with conventional oil.
Like someone else said, nothing to improve upon with those filters other than local availability (IMHO)... because price-wise their on-par with spin-ons.
What kind of BMW wagon/engine? By two OCIs do you mean you're changing the oil at 5k and the filter at 10k? What kind of conventional oil are you using, brand/weight? Is it doing well with 5k conventional OCIs? Clean under the valve cover? (Sorry for all the questions.) If so, that's a pretty good note for the OEM filters.