WOW, people are running 50:1! People must like rebuilding motors every other season? Everyone I know would rather foul a plug than rebuild a motor. At least 8-10 riders that I know all mix 32:1 (topping off the ratio rite). Plus I have not fouled a plug in a year and half!
I was not brave enough to try out the wal mart brand oil, so I went with the Pennzoil XLF. My buddy runs Quicksilver and we both mix at 32:1 and it is defineatly noticable that the Pennzoil XLF smokes much more.
Just last week I lost a piston skirt and toasted a cylinder. In addition, it also blew out a hole in the crank case. On a 2006 SJ original 701 motor, was running 185 psi. 5yrs on a motor, not bad! I am certian that the oil had nothing to do with it, but will stop cheapin' out and switch to quicksilver on my next motor.