There are a few other Boxster owners who are on the forum who have more mileage than my car. I think one of them is approaching 190k.
I change the oil every 10,000 miles. Air filter every 20k
Spark plugs, every time I change my means of forced induction
The car is on its second water pump, alternator, air oil separator, passenger side window regulator, water reservoir, and clutch.
I changed the RMS when the clutch was changed.
The drivers seat had a hole in it, so it was changed last Christmas.
My lifters lost fluid at one time and I had to replace an entire bank of them, that was at 90k miles. The Porsche mechanic said the engine was so clean he could not believe the miliage.
I always use Chevron/Texaco or Shell 93octane gas.
Mobil 1 oil.
One of the picky things I di that I think has kept my engine healthy is I NEVER rev over 4k rpms until it is fully warmed up, I avoid short trips. If I need to go to the corner store and the engine is cold I get to take the long way, this has 2 benefits. the car gets to stretch its legs and if my wife is in a hurry she goes herself
Common sense goes a long way, pay attension to the car. If something seems odd check it on it.
Good luck and go for a drive!!