[Perfectlap]

my advice.

Get an oil (what Excellence magazine in a recent issue recommended) with an at least 1,250-1,350 PPM ZDDP level. This recommendation came about from what the engine expert described as an increase in engine issues from those using low ZDDP content oils, inferring that Mobil 1 was only to be used for short intervals, meaning at least 3 annual M1 oil changes if you drive not less than 10K miles. Which would probably mean taking your Boxster to an independent Porsche mechanic near you if you wanted a more protective oil, since I'm pretty sure a Porsche dealer would charge you not a discount but a steep premium for a high ZDDP boutique brand oil - if they would even allow this in the first place. You'll save money buying your own oil online. I give my mechanic my own oil all the time. For a time I was going to a Mobil 1 oil change place with my own Castrol syth oil as well and they too would only charge me $20-$40 labor/waste charge. I supplied them with the oil wrench, filter and a torque wrench. Using Castrol Edge, usually purchased on sale for $50/10qt with what looked like a rebranded German filter (Puralator but probably orginally MAHLE ) tossed in, total cost was slightly over $100. Which I did twice a year.

p.s.
This might be a good time to take an oil sample and send it to Blackstone labs to set a benchmark. Do another test after a few oil changes.