348SStb

You didn’t change the brake fluid at the two-year mark? It’s standard operating procedure to change it every two years, regardless of mileage and regardless of test results.

I will not comment much on the spark plugs since that has been well discussed here and elsewhere. It’s a matter of personal preference of following manufacturer recommendation versus real-world practicality. I never argue with a manufacturer because I might need the manufacturer to back me up in a warranty or even a non-warranty situation, and the first thing they do is determine if the owner followed their service schedule. Porsche offers Porsche-backed warranty for years 5-12, and since I have purchased that plan on other Porsches, I do the maintenance according to the schedule so the warranty coverage will be there for me if the engine decides to blow up.