Good video that shows some basic eye tests to see if old oil has already started getting unusable. Especially, the fact of outside contamination w/open bottle etc. Anti-foam additives no longer doing their job couldn't be more obvious for anyone to see...LOL. Along with dark oil color from the old oils were apparent. What's ironic about some oil companies saying five year shelf life coincides with a filter company telling me their oil filters have a five year life too. This is all interesting!
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