if its 2 stroke its normally 100ml per gallon you can get oil already measured out http://www.amazon.co.uk/Stihl-2-stroke-oil-100ml-shot/dp/B007KGFDPO/ref=sr_1_1?ie=UTF8&qid=1372962632&sr=8-1&keywords=Stihl+HP-2+stroke+oil
mik
July 2013
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix gardening.