[PTLady]

I use Mobil 1® With SuperSyn™ Formula 15W-50

This is what their web site says:

Benefits of Mobil 1 with SuperSyn™ 15W-50:


Excellent for supercharged and turbocharged engines, muscle cars and amateur racers.
The highest viscosity Mobil 1 available.
Race proven.
Superior high-temperature protection for high-performance and high-revving cars. Contains extra SuperSyn™ anti-wear system.
Mobil 1 with SuperSyn™ 15W-50 is factory fill in Ford Mustang Cobra R.
Exceeds API SL/CF.
Exceeds ACEA A3/B3/B4-02


Since the PT takes 5 quarts, I use 3 of the above and 2 of 10w 30. As summer gets closer, I will use 5 of the above.

PTLady