158k high mileage oil recommendations ?

[78F350]

Originally Posted by piper6909

I still don't understand why so many people use so many different grades, when the manual seems pretty specific. ...

What year was your manual written? Think back to that year. How many M96s had failed? How many in the years since then? Go back and read the first page of this thread for a recent list of Porsche approved oils. Maybe Porsche changed the list as they learned more and oils improved. ...or maybe they benefit from promoting certain products.

disclaimer: I used Rotella T6 on my waffles this morning. It is not approved.

(OOPS! I just kept it going)