Yes, 2 cycle oil can go bad. If sealed, two-stroke oil usually good for up to 5 years. If opened, the shelf life is reduced to 2 years. Once mixed with gas the fuel should be used within two months.

How long is 2 cycle oil good for?

Two- stroke oil will last for a couple of years when it is not mixed with petroleum. Once mixed with petroleum we would not recommend keeping for more than 3-4 months in a sealed air tight approved storage container.

How long before 2 stroke gas goes bad?

In general, pure gas begins to degrade and lose its combustibility as a result of oxidation and evaporation in three to six months, if stored in a sealed and labeled metal or plastic container. Ethanol-gasoline blends have a shorter shelf life of two to three months.