Dale,
It took over 7 gallons of 32:1 Penzoil Aircooled to get past break in on my 75I, tried to switch to Amzoil 80:1 at 4 gallons and the motor got hot so I switched back to penzoil. At 7 gallons I switch to Redline synthetic 40:1 and gained RPM and the motor runs just as cool as on penzoil (160-170 degrees F)

No carbon build up, great response no saging at the end of the flight and no sewing machine sound on long uplines. The motor keeps getting stronger. Swinging a 3W 26x11 carbon at abou 6150 on the ground. She really unloads in the air.

3W 4-ever !

JDS