I realize there are thousands of posts on TT concerning this issue, and I've read many of them over that past hour... Nothing seems conclusive to me... I've always used Yamalube 20/40 in my bike, but I'm tired of driving the 45 minutes to the shop to pick it up... Yeah, I could buy it in bulk, but I'm hoping to avoid that. Is there another motor oil out there that I can run in my bike? Something I can pick up at Auto Zone or Wal Mart? Are synthetics really that risky? Is Mobil I 15/50 the way to go? Should I avoid automobile oil altogether?? Thanks for any input!