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50:1
The Stihl 028 series number is 1118. It has an aluminum-and-chrome-plated bore, intake by piston pore and weighs in at 6.3kg with a 33cm bar and chain. It also has anti-vibration, the oil pump is automatic, and the engine has an RPM of 12,500, an idle RPM of 2,700, with a fuel tank capacity of 520ml.
I gather it is an MS310 and Stihl's oil mixes at 50:1
Use regular Stihl 2 cycle oil. You mix it 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.
The fuel mixture for a Stihl chain saw is gas and oil.
All Stihl products use a 50:1 mixture
Some Stihl chain saws have an adjuster underneeth the saw to turn up the oiler .
I use 40:1 mixed with high quality 2-stroke oil. I have used this mix in 1000s of chainsaws without any problem. http://store.chainsawr.com/
I recomend 40:1 with good quality oil. http://store.chainsawr.com/
50/1
For 2-cycle oil it is 40:1 and for 30 weight auto oil it is 25:1