Gasoline is typically a mixture of approximately 150 different types of hydrocarbons.
You can expect three to six months of shelf life if you buy regular gasoline from your local gas station.
If your gasoline has expired, it will have a darker or muddier color. You may notice a sour or awkward smell that you typically don’t experience with gas.
For starters, expired gas will more likely convert into a gum-like substance and create blockages in your fuel system and engine.
Old gasoline degrades over time. If you mix old and new gasoline, you’ll only lower the quality of the new fuel.