Wood luv I am sorry about the fact that you do not have a saw that you were once happy using. Myself I never ask or try to get any shop to do anything because they often make their living ripping people off. There seems to be some folks here that have a great reputation rely on them regardless of the cost or shipping charges. Reputation is more than priceless. The fact that you did not work on your own saw says that you are uncomfortable in such endeavors. Sorry that makes you an easy target. Get a Huztl saw and ask some one here to make necessary repairs. I use any old oil that I come across with out problems including outboard motor oil. I think the key is I adjust and tune my engines precisely when ever there is any changes. That includes weather, mixes, oils, fuel. and altitude then double check the plug just to make sure I have not lost my mind. BTW I really do not trust any oil at 50:1 and I never listen to any tech that is going to ask me to pay for something. The folks here are as good as you are going to get they do not have their hands in your wallet. IF you made any changes with the fuel and oil with out tuning and checking your plug there is your problem. Thanks