Use regular Stihl 2 cycle oil. You mix it 50:1.
I gather it is an MS310 and Stihl's oil mixes at 50:1
An oil tank for a Stihl MS310 can be bought directly from Stihl dealers. Alternatively, there are specialty shops online that sell chainsaw parts.
50:1
Some Stihl chain saws have an adjuster underneeth the saw to turn up the oiler .
I recomend 40:1 with good quality oil. http://store.chainsawr.com/
For 2-cycle oil it is 40:1 and for 30 weight auto oil it is 25:1
50 to 1 2.6 oz oil to 1 gal. gas
. What is the correct gas/oil ratio for STIHL products?A. When using STIHL branded Two Cycle Mix Oil, a 50:1 ratio (1 gallon of gasoline to 2.6 oz of STIHL 2 Cycle Oil). STIHL has Two Cycle Oil in easy to use bottles that are pre-measured for easy mixing with regular grade gasoline that has a minimum rating of 89 octane. Refer to your owner manual.
I have the owners manual for my 041 farm boss it states " The mix ratio1:40 with stihl oil and 1:25 for other branded oils
40:1 with high quality 2-stroke oil mix would be fine. http://store.chainsawr.com/
The mixing ratio using Stihl brand oil is 50:1 or 2.6 oz. oil per gallon of gas. Stilhl oil is recommended though a name brand oil for another air-cooled equipment brand could be substituted. Most are the same ratio.
The oil it calls for is Poulan which is 40:1. A good quality name brand (Stihl, Echo, etc.) will work fine when used as directed.