Elderly lady living across the street gave me an opened jug about half full. I never want to waste anything, so, I do want to use this oil. I know this sounds crazy, but does Rotella have a strong distinct smell? More so than typical PCMO? It looks and feels like new oil, jug is in good shape. However I smell a bit of a sharp/sweet smell, similar to paint thinner, but definitely a bit different. I don't want any type of contamination... Any ideas? Thanks.