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It depends on the brand of trimmer you bought.

Stihl, Echo, Husqvarna use 50:1, or 1 gallon of GAS to 2.6oz of 2-stroke oil

Weed Eater, Poulan, and Poulan Pro use 40:1, or 1 gallon of GAS to 3.2oz of 2-stroke oil

Ryobi's use 32:1, or 1 gallon of GAS to 4oz of 2-stroke oil

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15y ago

What else can I help you with?