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
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