cleaned out garage and found a full bottle. been there at least 2 years?

 

It's fine.

 

it will work just fine. i had a full bottle for over a year and it will last forever aslong as the bottle doesnt leak. its a liquid and doesnt covert into a gas until it hits the motor and sees oxygen, heat, bla bla bla. you could store it for 10 years and still use it like you filled it the day before.....

 

As long as it dosen't get exposed to realy high temps. The burst disk would blow first.
That is the only thing that could break it down while in the bottle.

 

thanks.