+1 on above. Don't get lost in the weeds of all the opinions and options out there. Sticking with the OEM speced replacements will work just fine and doing so on a reasonable maintenance schedule
Definitely check those coil packs for cracks. They do crack. I had 3 of 6 cracked under 95k miles.
Check the plug tubes for oil leaking as well. It's all in the same place
You may want to replace your oil filter canister as well as there is a relieve spring in there that can age. Cheap part even though it is a Porsche replacement (My only actual Porsche replacement part)
I have a 2001 s, that i have only had 6 months. I used Mobil 1 0- 40 with a Hengst filter. That is what previous owner used, so I decided to continue with same