You can go into the gas engine forum and ask someone in the manufacture support. I run them and leave them wet but mine get flown all season long. All of my under the bench engines were left wet and after two years of sitting they were fine and fired right up. These were with normal two stroke oil. I just put one under the bench waiting for repairs but this one will be cleaned out before long storage. I used some Klotz oil I had on hand and it contains Castor oil!! Castor and long storage can lead to gumming problems. I haven't had any problems with gas mix harming the diaphragm in the carb but I have also got the diaphragms used for gasahol. Go look up your question in the gas engine forum for better info, what works for me may not work for everyone.