Linda & the Oil in Her Car

Linda has not been changing her car's oil on a regular basis.

This is what normal motor oil looks like, under a microscope. Yes, this is a genuine photograph of oil. Remember, it's a thin layer that we're looking at, so it looks much lighter than when we are pouring it from the bottle:

(Not bad, huh?)

This is what the oil in Linda's car looked like, before I changed it:

(This picture has the same magnification and lighting as was used with the previous picture.
Of course, it would look much blacker, if it weren't a thin layer viewed under a microscope.)

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