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Gas to oil ratio is a function of the oil you are using. Mix according to what the oil says not what the manufacturer of the engine says. Those ratios could/may be the same. IF you mix 16:1 oil (do they even sell that anymore ?) at a 50:1 ratio it will destroy the engine. There will be no problems at 16:1 as the oil recommends.
I have used 100:1 Optimoil (?) when I can find it instead of the recommended 48:1 of my 2cycle. No problems.
Mix the oil in ratio the oil manufacturer says to mix.
The ratio is generally 40 to 1. That is all I have ever used. It depends also though on the quality of the oil you use. Synthetics can use a different ratio than mineral oils.
First check that your Mantis needs an oil/gas mixture, most of the newer Mantis tillers have four-stroke motors meaning they have oil in the crankcase and use straight gas. If your Mantis needs oil mixed in the gas use a 50:1 ratio. That's usually 2.6 ounces of two-cycle oil (it's sold in bottles that size) to one gallon of gas but read the oil bottle to get the proper mix ratio.
It's 40:1 but there are oil mixes out there now that you can buy that you mix with one gallon of gas and then it is safe for all 2-cycle engines...a real plus if you own multiple units with different mix ratios.
40:1 is the standard mix. Go buy one of the little containers ( 3.2 ounces) of 2-cycle oil and mix it with a gallon of gas in an approved container (like a gas can). How you mix it is, pour some gas in the container...about 1/4 of the gallon, then pour in the oil, mix well, by shaking the can then add the remaining gasoline and PRESTO, you have a 40:1 mix!
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