Rotella is stout stuff. I'm just about to change it in my 993, about 7k on the oil, and will post a new Blackstone report. Here is my older report.
Our 993 is my wife's daily driver and her commute is 3 miles, one way, so it never really warms up. I changed from 15-50 Mobil1, with high wear levels, for that reason.
Cheers,
Jess
