Unleaded gasoline at a few years of age is no longer properly gasoline and won't combust inside an internal combustion engine of the design in any automobile, motorcycle or.

Mix old gas with new gas. The old gas degrades over time it should not be added because it has already lost it's combustibility. Mixing old gas with new gas is normally not an issue for most vehicles. Can you use 4 year old gas?

Gas begins losing its combustible properties and leaves behind a varnish as soon as 30 days after purchase. I am going to do a minor service on it and the gas is probably 2 maybe 2 1/2 years old. I figured i'd use it's electric fuel pump and pump the old gas into a container.

There is another trick that one of your uncles or perhaps your father knew about when it came. If you only have a half of tank of old gas in. 1 year old fuel will be fine if the can is properly closed.

When you add new gas to a tank that has old gas in it, the two ages of gas will mix and still be usable for your vehicle. Even 10 year old would probably fire up ok, at least on fuel injected engines where the system is more or less closed to. Old and new gas should not be mixed for a variety of reasons, the major ones are;

However, gas that is more than two month old is generally ok to.