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The Ryobi TP30 also has the model number RY52014. This 2-cycle engine uses a 50:1 gas to oil ratio. That means that for every gallon of gasoline, you need 2.6 oz. of 2-cycle engine oil. This information is available on page 9 of the manual. Manuals Lib has the manual for the TP30 trimmer here: https://www.manualslib.com/manual/143217/Ryobi-Ry52014.html .
Two cycle engines run on a mixture of gasoline and oil. Each engine type is designed to run on a specific gas-to-oil mix ratio.
IMPORTANT: Use only oil that is labeled for use in "Two-cycle" or "Two-stroke" engines. Home Depot and other stores now have "premixed fuel" of gas and 2 cycle oil.
To mix two-cycle fuel, start by putting correct amount of oil in gas can. Then slowly add correct amount of gasoline. Do not try to mix gas and oil directly in gas tank of equipment.
IMPORTANT: Do not use any fuel that is over 30 days old. Do not mix more fuel than you are likely to use in a month. Old fuel can gum carburetors and prevent starting. Always use fresh fuel.
The chart below shows correct amount of oil per gallon that each mixing ratio requires. Expect that yours will be between 32 gas to1 oil and 50 to 1. 32:1 and 50:1 are most popular. RatioGAS:OILUNITED STATESOIL per 1 U.S. GALLON Gasoline
(128 oz.)*INTERNATIONALOIL per 1 IMPERIAL GALLON Gasoline
(160 oz.)*INTERNATIONALOIL per 1 LITER Gasoline
If this is a 2-cycle engine, Ryboi are 50:1
check age of gas. Cannot be more than
30 days old. Make sure to use fresh gas w/synthetic 2-cycle oil @ 50:1 ratio
(1 gal.) Gas to 2.5 oz. Oil). Do not use old or stale oil/gas mixture. Always
use the proper oil/gas mix. If you do not, your engine will suffer rapid,