There's a guy on my FB list that owns a Porsche, but I'm not sure if he is on Pelican. When I posted a couple pix of oil change the other night, he asked what oil I use. When I mentioned Shell Rotella T1 40 wt., he get a bit upset and defensive. Said that the modern oils were good and since the Rotella is primarily for diesel equipment, I'm doing harm. He linked Charles Navarro's link to oil - which shows that the SJ formula the Rotella I use is recommended. I explained to him again that it is okay for my year 911, but have yet to hear back from him.