Oil filter Bosch or Wix

I used to strictly go OEM with the blue filters, but switched to WIX after watching this:No issues to report.. little more peace of mind

I use Wix oil filters because they're cheaper than the Kawi ones, and I've used the wix brand for the better part of a decade and had no issues with it on any of my vehicles.

Make sure you pair the oil with a high-quality filter. I prefer Wix.

Honestly I just use whatever BMW certified oil I can find at a good price. Used Motul this time, had Castrol before that. Bosch oil filter.

I've used Fram, Supertech, Denso, O'Reilly or Autozone store brands, WIX.

Pennzoil Ultra Platinum 0w/20 with Wix/Napa Gold filters. -been relentless about 5k services, @45k now.

-just received my first ever Blackstone Lab analysis, TBN numbers were still extremely good. Blackstone advised me to push my next service to 7500 miles.

-the oil that was sampled, was still a very light Carmel color - I feel guilty throwing away oil that still looks this good

I use OEM filters on both, but I’ll use Wix filters if I’m not around the dealer.

I bought a 10 Wix filters off of Rockauto. Part #: 51394. Each one was $4.80 and shipping was $10. Came out to be roughly the same price as buying OEM ones from a dealership off of eBay and I would rather use Wix ones.

I have a 2001 Passat 1.8T, on which the oil and filter have been changed every 6 months or 3K mi, whichever came first. The dealer performed the first 4 oil changes, to the 2-year point, then I took over, always with a Bosch or Napa Gold (Wix) filter. Having received the engine sludge notice, I switched from name-brand dinosaur oil to Mobil 1 at my most recent oil change (last month, 23K miles). Although I receive no adverse temperature or indications at the instrument panel, the valve cover SEEMS perhaps to be running a bit hotter than before. What really concerns me is that, when the engine is warmed up, if I stop and idle it for 30 seconds or so, the engine starts making what to my semi-practiced (but new to VWs!) ear sounds perhaps like valve, lash adjuster, or camshaft bearing clatter. The sound emanates from the rear/cylinder 3-4 area, away from belt-driven accessories, etc. Does this sound like an early symptom of sludge, perhaps associated with insufficient oil pressure at idle? Given my history of frequent oil changes and otherwise by-the-book or better maintenance, I would not have expected to be a sludge victim at 23K miles. I suppose I could have just installed a defective brand-new Bosch filter, or I suppose the synthetic oil could have loosened some sludge from my dinosaur days, but these seem like real stretches for an explanation. Any suggestions regarding diagnostics?

After much searching and reading DIY threads, I didn't see any mention of springs for the filter. Your replies confirmed it so I was confident enough to throw the Bosch setup in the trash.