Small Engines (Lawn Mowers, etc.): Gas to oil mixture ratio for a Stihl FS110 Weedeater, stihl fs110

Question
I received this weedeater as a gift and did not get the instruction booklet that comes with it. I bought a multi-ratio oil mixture but do not know the recommended ratio for this model. I tried to research the answer but am now more confused than ever. Can you please help me?

Answer
Use the Stihl oil at a 50:1 ratio.  This will cover you if there's a warranty issue.  I'm not sure about Stihl, but many manufacturers dye their oil so it can be id'd if there's a warranty issue.  So it's best to use the manufacturer's recommended oil at least during the warranty period.  

This link is to a manual for your trimmer.

http://www.stihlusa.com/stihl_ownersmanuals/FS110_Manual.pdf

Thanks, PK.