Myth Busted: Engine oil that’s turned black is no good

Photo Credit:  wikipedia

Engine oil that turns black is actually a sign that the oil is working. Modern engine oils contain detergent-dispersant additives that keep engine internal parts clean by removing carbon deposits and maintaining them in harmless suspension in the oil.

It is better to have the carbon deposits in the oil so they can be drained off than to have them left as deposits in the engine where they could do the most damage.

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