Can you use gas that has 2 cycle engine oil in a 4 cycle engine?

Answer 1

It is not recommended as the 2 cycle fuel has oil in it and can clog the carb creating a no start condition as well as a heavy duty smoking condition should the engine run on this mixture, not too cool for the environment.

What is stated above is correct, but if you did with out knowing, there well be no engine damage. The oil mix can clog carbs, some engines may run on it, others not. Plug would not be correct heat range for oil mix, could foul plug. Carbon more then likely well form on valves and in combustion camber. I am a small engine mechanic (retired 20Y), and I run it in my 4 stroke. I put a new engine on my snapper, and have used 2-cycle gas in it for over 4 years now with out a problem, no change in plug. I know better, but am tired of running out of one gas or the other, so I only get 2-cycle, as my trimmer and lawnboy run that. I'm going to change the head gasket just to see what has gone on over the last 4 years with the camber and valves. Don't do what I done, warranty would be void on new engine, and they would know in my case, once or twice, no. I'm still running the plug that cam with engine new. So tune up will be done with head gasket. If I have a real bad carbon problem, will go back to regular gas. So don't be lazy like me. I can fix any problems that arise, you may not. May be extra work on my part. Also, believe it or not, if you use a good 2-cycle oil, it well not smoke. I get a small puff at start up, but not running. I use Lawnboy oil.