ORIGINAL: aerobob
Remember, these are CHAINSAW motors....
I use Pennzoil because of the various write ups about it. You can order a 12 pk on the Internet for a pretty cheap price
That is another thing that makes these motors almost too good to be true. They are piston port--no extra parts to go bad--designed and proven to be robust. No purpose built model aircraft motor of similar weight and power can compare with this expected reliability and ease of care/use.
Do you remember where you are ordered the Pennzoil online?