if you have piston slap, you may have a small piston for the bore size, pull it appart and check clearances to make sure there isnt an issue before it damages the cylinders/motor.
bought a vegas jeff seat cover off of him, he took the time to pry the staples so it wouldnt rip the cover, and shipped it to me fast. great guy to deal with.
from everything i have read, 100ll is not oxygenated.
Also, depends on your gas provider, my local airport it is 108octane, im friends with the owner of the place.