What is coking?

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47,693
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Duvall WA - Pacific NW USA
a term basically describing oil oxidizing at a temp so high the oil "crustifies" to the state of coal... Basically the reason for using synthetic oil in a turbo. The oil passages/oil bearing very close to the exhaust (temperatures) can "coke" - a real phenomena especial at on hot shut downs, because the oil is not actively flowing through these hot areas.
 
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6,388
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Washington St.
One type of coke is coal heated without oxygen to create a near-pure carbon fuel. Petroleum coke is a black, granular, end product of refining crude oil. Ken
 
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