This weekend I tried to start up my Ryobi Weed eater and I couldn't get it to turn over. I went to home depot, and a "specialist" there said that the gas/oil combination will go bad after 90 days and that I need to replace it. He also said that it will cause a goo buildup in the gas lines. This is my landlordís equipment, so I'm not sure how old the gas is, but has anyone else had this happen. Any Suggestions??