My 2001 boxster S is at about 94,000km. This is my 3rd summer with it. I think i got it with about 72,000km. The past couple years I run it from March/April to October/November.
I'm thinking about the plugs, and probably the tubes. I don't know the service history of the car before I got it from the Chicago area. Searching through the threads, some here don't see the tubes as a wear/maintenance item. I frequent the Rennlist Canada forum, and all the pcar owners there seem to replace the tubes, especially if one is leaky.
No drips that I can see on the garage floor. I haven't taken a look at the coils/valve cover recently to see if there are any drips
I need to order a $14 hose for my Jetta (they want $93 for a crankcase vent hose from the local VW dealership). I get free shipping at $75 (otherwise it's about $10-15 shipping).
6 Bosch plugs is $47
6 Tubes by Febi are $53
I can also pad the order with a Mann Oil Filter, and Mann Air Filter. to get to $75, or a filter for one of my other vehicles.
I am not one to normally replace plugs. My Jetta had the same plugs in it for a long time, probably over 100,000km. I guess the Porsche ones aren't platinum though.