I've been experimenting with the HP Ultra since Pat started talking about it here in the forum. It sure seems to be everything he says it is and then some. (For some strange reason I am not surprised considering what he does) I have been using it in my DA50, DL50 and MVVS 26 and all seem to really like it. I haven't pulled a cylinder yet but have looked though the plug hole and the piston looks clean so around 50 hrs I'll take a closer look.

For the Pennzoil I was using 32:1 but for the synthetics I mix at 40:1. I have not tried it with Redline or HP Ultra but the Pennz made more HP each time I added more oil. I tried it all the way to 16:1 and each time got more power. (I see NO reason to believe the synthetics would be any different) I settled on 32:1 with the Pennz because it made OK power but less mess. 16:1 puts a bunch of oil out on the plane.