Sta-Bil recommends that you use the product within 2 years of opening the container. For most of us, the 32-ounce bottle is way more than we'll use in 2 years, so either we're going beyond its recommended shelf life, or just throwing out the remainder at that point.
I have never used this stuff and I never have any problems in 1/2 century of working with all sorts of equipment of all sizes, from lawnmowers to boats to cars and planes.
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Thank you!