Hi Paul, and a warm welcome to the forum. Its great to have you aboard. grin

Generally, we use 25:1 for most 2 stroke applications, and we have had no issues with it...the oil that I use is Shell 2T in the 200ml plastic bottle. I also recommend that you use premium unleaded; as some fuel retailers have a percentage of ethanol in the blend, which should not be used in small engines (It can affect the seals, gaskets etc). wink
What does concern me is your warranty.....does the 2 stroke mechanic work for the dealer that you bought the blower from?.....If he does, I don't think you will have probs running 25:1, which in effect is just running more oil....which for engine life is a good thing. grin
Once again Paul, :welcome: to OutdoorKing.
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin