My motor oil has turned black. Why?

Because carbon from the combustion process is mixed into the oil.  Motor oil has 2 vital functions: lubricating and cleaning internal moving parts.  Carbon is produced as fuel and the minute oil film on the cylinder walls are burned during the combustion process.  Some of this carbon passes by the piston rings and into the crankcase.  The motor oil gets into every crevice and cavity inside the engine to lubricate and clean.  As it cleans the internal components, the carbon and other debris is suspended in the oil.  This causes the engine oil to blacken, proving that the oil is doing its job!

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My motor oil has turned black. Why? | Fairwinds Marina

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