Long-life engine oil composition with low or no zinc content

Details Long-life engine oil composition with low or no zinc content Long-life engine oil composition with low or no zinc content

C - Chemistry, Metallurgy

10

M

C10M 129/54 (2006.01) C10M 129/10 (2006.01) C10M 135/10 (2006.01) C10M 141/08 (2006.01) C10M 159/20 (2006.01) C10M 163/00 (2006.01) C10M 137/10 (2006.01) C10M 141/10 (2006.01)

Patent

CA 2688659

A lubricating oil especially useful as a natural gas engine lubricating oil that has extended life as evidenced by reductions in viscosity increase, oxidation and nitration relative to current commercial and reference oils is provided. The oil comprises a major amount of a base oil of lubricating viscosity and a mixture of metallic detergents comprising: (i) a neutral calcium alkylsalicylate detergent and (ii) a second neutral or overbased metallic detergent or mixture of detergents other than neutral calcium alkylsalicylate selected from the group consisting of calcium and barium sulfonates, phenates and alkylsalicylates. The composition is further characterized as having low or no zinc.

L'invention porte sur une huile lubrifiante particulièrement utile comme huile lubrifiante pour moteur à gaz naturel qui a une durée de vie prolongée telle que mise en évidence par des réductions de l'augmentation de viscosité, de l'oxydation et de la nitration par rapport à des huiles courantes du commerce et de référence. L'huile comprend une quantité majeure d'une huile de base de viscosité lubrifiante et un mélange de détergents métalliques comprenant: (i) un détergent d'akylsalicylate de calcium neutre et (ii) un second détergent métallique neutre ou surbasé ou un mélange de détergents autres que l'alkylsalicylate de calcium neutre choisi dans le groupe constitué par les sulfonates, les phénates et les alkylsalicylates de calcium et de baryum. La composition est encore caractérisée comme ayant une teneur en zinc faible ou nulle.

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