| 摘要 |
A substantially magnesium-free lubricating oil composition comprising a mixture of at least two metal-containing detergents, a first detergent (a) being a metal phenate, sulphonate, salicylate, naphthenate, or carboxylate, and a second detergent (b) being a calcium overbased complex detergent comprising a surfactant system derived from a mixture of surfactants including sulphurized or non-sulphurized phenols or derivatives thereof and/or sulphurized or non- sulphurized salicylic acids or derivatives thereof. By addition of complex detergent (b), the composition exhibits improved corrosion protection and deposit control.
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