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Are you sure about the model number? I see several 30CC engine string trimmers by Ryobi. Two are the Ryobi RY30040B (SS30) and a RY30544 (SS30).
For both of these models, mix a high quality 2-cycle engine oil at 2.6 oz. per gallon of gasoline to pour into the gas tank. This ratio is used in several other Ryobi string trimmer models. Many Ryobi product manuals are available here: https://www.ryobitools.com/power-tools/support/manuals . Most Ryobi gas powered and 40V battery-powered tools will have a model number that starts with RY. The 18 V battery powered models often start with a P.
I hope this helps. If you add a comment with the actual model number, I may be able to provide more information.
some of these machines are 40:1 and some are 50:1 please check your owners manual,or ask the shop where you bought it,be very careful as the incorrect mixture can damage the machine,rgds
The proper gas/oil ratio is 50:1, that is 50 parts gas, to one part (2) cycle oil.
If you plan on leaving gas in the tank when not being used, I always recommend adding some gas stabilizer, such as Sta-bil, which makes starting the chain saw easier regardless of how long the fuel mix has been sitting in the tank or saw (up to 2 years according to Sta-bil label)
16:1 ratio for most 2-stroke oil brands. A service manual recommends tro check the ratio marked on the bottle if using Homelite brand 2-stroke oil. For other oils, 16 parts of gas to 1 part of oil.
For 1 gal of fuel, that is 270cc of oil required to meet the 16:1 ratio.
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