I went from Pennz 32:1 to Stihl Ultra 50:1 and really like the stuff. Jody from Valleyview recommended it. The Pennz 32:1 really stained my covering. The Stihl cleans up with only a paper towel. Also lots of people sell this oil, anybody that is a Stihl chain saw dealer. Mine was $18 for 6 pack of 6.4 ounce bottles.

WRK where do you fly? I'm in the Flying Electrons club in Menomonee Falls.