First time I bought one I made the mistake of buying it at the dealer...$30.
anyone else who is interested in buying on the web
https://986forum.com/forums/PAP-Parts.com has the Mahle which at on point were the OEM brand. Don't know if that's still the case.
I drive under 10K miles a year so I was thinking about changing the filter every 6 months and the oil once a year. Is it a bad idea to drain the engine, change the filter and then reuse the oil? Seems like overkill to change synth oil every six months (and expensive!). But changing a $10 filter frequently seems like a good practice.