How long does 2 cycle oil keep once opened…I would say a long time but does the stuff go bad. I was given 3 one gallon jugs that has been kept indoors for around 4yrs
pennzoil tcw-3 lists a shelf life of 5 years . I know others that list 15 years . either way yours should be good . If your in doubt pour it into a clear container and if it is discolored or sludgy in any way ? discard it .
Much more likely to go bad because of contamination than age.
I agree with Heyblue. If it’s sludgy or discolored take it to the autoparts store for waste oil disposal.
The big guy
Its dark green. Havoline is the brand…I normally have blue oil. I’m guessing that it is bad.
some oils are green, some are blue, soem are brown…
I have been using the Wal-Mart oil for a couple of years now. It is a nice shade of green, which is what it saves me over brand name stuff.