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mobil 1 normally but right now the new motor is still in its "break in" period so it has dino oil in it right now. next oil change the good stuff goes in
I did a test years ago while racing a Honda 750. It had a seperate oil tank and when I saw foam on top of the oil at the end of the quarter with Quaker St. I decided to check out other brands. Each week a different brand and Valvoline racing didn't have any foam after a dragstrip run. That was good enough for me to use during all my musclecar years and racing. (bearings don't like foam) Now with my 07/V6 I use Motorcraft. On my 95 Mustang I just was doing oil changes at the dealer and it worked fine. One oil change I did Iused Pennzoil (out of Motorcraft) and I heard a ticking noise, next day I brought it to the dealer again and got Motorcraft back in and the ticking stopped. So Motorcraft for normal driving and Valvoline if racing & street use.