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Two years without changing the oil!
I have a relative that went two years without changing the oil. Now the car doesn't run.
From what I understand oil will thicken at first but then go thin. Or maybe the other way around.
Looking at the oil really isn't a good way of checking viscosity. This is especially true when testing the oil cold because most the time oil will be much warmer and could thin out a lot more at higher temps than what you see when cold.
Lots of things could happen from not changing the oil. Probably one of the most common things is that the rings get gummed up from lack of detergent, then it starts pumping oil up into the cylinders and burning oil.
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