Quote Originally Posted by OrangeL67 View Post
^ This. Call me crazy, but I thought that's what oil was for.
Fuel acts as a lubricant for the cylinder walls. Ever had a bad fuel injector? Things get hot quick without the lubrication from the fuel. They do sell upper cylinder lubricants that you can add to your fuel. I was using Lucas upper cylinder lubricant for a while when no one was buying premium to try and offset the loss in octane from fuel sitting.