Does unopened motor oil expire? The answer is yes. The general consensus is that motor oil should last for an “extended period” under optimal conditions—in the original unopened container and stored away from extreme temperatures. The motor oil’s shelf life recommended by each manufacturer varies, though For example, Mobil expects motor oils to last for 5 years, if stored properly in the original container. Meanwhile, other manufacturers, say motor oil should be disposed of only after two years, if not used. Obviously, it's worse if the container has been opened. This is because of possible contamination from water condensation or dirt or oxidation. To check on the oil, you should look for the manufacturing date on the container and check for color and consistency. For more information on this topic see: Does Motor Oil Expire? How Long Does It Last? (Facts VS Myths)
