Why is Castrol called the 'Sludge King'?

1 Answers
DiClaire
07/25/25 6:43am
Castrol focuses on anti-wear properties and engine protection, adding more anti-wear agents, which results in relatively more sludge, hence the name 'Sludge King'. Sludge refers to impurities such as carbon deposits. The engine oil itself does not produce sludge; sludge is formed from carbon deposits generated during the engine combustion process. The amount of sludge produced depends on the engine's condition. Engine oil is referred to as the 'blood' of the engine, serving functions such as lubrication, cleaning, sealing, heat dissipation, cushioning, and rust prevention. Without engine oil, the engine cannot function properly. Engine oil is composed of base oil and additives, with additives enhancing the oil's performance. Common engine oil additives include antioxidants and dispersants. There are three types of engine base oils: full synthetic oil, semi-synthetic oil, and mineral oil.
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