My grandma is moving into a condo and I'm helping her get stuff ready for a yard sale. I came across 12, 32oz. bottles of Citgo 2 stroke oil. Its from before my grandpa died,that was '95. Its all completely sealed from the factory. Its rated TCW-2 so I can't use it in my new outboards. If its never been opened,is it still ok to use it in my old '89 Evinrude?