Thread: which 50-60cc Stihl chainsaw

This thread has gotten off track drop OP but getting fuelil mix right isn’t difficult. Have used this formula since 1976. Same formula as taught at trade school in ‘79.
Take number of litres of fuel, multiply by 1000, divide this figure by your mix ratio and this gives you the amount in mls ( millilitres ) to add. eg. 50:1 mix.
5 litres fuel x 1000 = 5000, divide this by 50 = 100 mls oil to add.
Works for any ratio, has done all these years and never had an engine issue due to fuel mix.
I work in the trade and in the case of suspected engine seizure the first thing we do is carry out a fuel burn comparison test: straight fuel: known fuel mix: fuel mix from engine in question. Quickly shows potential fuel mixing cockup. Move on to other engine checks after that if necessary.
We have forest crews using Stihl oil no problems, two operating 30 saws each plus others using up to 10 or more. Opposition has similar numbers running Husqvarna saws/oil. Haven’t heard of any problems from them. We both get customers who have dipshit moments and straight fuel their gear.