"enviro friendler" oil filter -- any difference?

[BimwadM42]

Given the option, I've always used the Mahle OX 91D, or the older Mann HU 921 with the metal end caps.

But for whatever reason, it will be easier to source the HU 921X this time, which lacks the metal end caps, and has a plastic core, I believe.

I have full confidence there is no practical difference, and it will be fine, but I wanted to ask anyway.

With as little mileage as I put on the M42 these days, oil changes have become an annual thing, so it will have to sit submerged for a year without coming apart.

[Nelson_40]

I thought it was a quality filter when I put it in, and when I removed it ~7300 mi later, no degradation that I could see. Total time in the car was a little under 3 months. I think you should have no problems, Mann makes high quality filters after all.

[BimwadM42]

OK, thanks.  I ordered one so I'll discover how it fares on my own.

I've never really looked into how the M42 filter flows, but I guess it goes inward, so the material holding the pleats together is strong enough with a cap?

Also wondered what the perforated outer band around the Mahle filters was for.  Always seemed somewhat flimsy, and would invariably end up sliding downward to the bottom edge during usage.