[clickman]

Have a look at Post 14 in this thread regarding Mann/Mahle filters:

http://986forum.com/forums/general-discussions/26921-spin-oil-filter-adapter-void-my-warranty.html

And this thread:

http://986forum.com/forums/general-discussions/35564-ln-spin-oil-filter-adapter-3.html

Once you get past the arguments in the latter thread, the facts show a shop that works on a lot of Porsches finding quality problems with the stock filters.

I currently use the Napa Gold 7211 filter, but am planning to change to the spin on oil filter to ensure full filtration all the time. I'll be doing my winter bedtime oil change in a few days and out of curiosity am planning to check the status of the bypass valve in the stock filter canister.