C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 143/00 (2006.01) C10M 145/14 (2006.01) C10M 149/02 (2006.01) C10M 149/04 (2006.01) C10M 149/06 (2006.01) C10M 149/10 (2006.01)
Patent
CA 2253896
-26- Zinc-free medium-speed diesel engine lubricating oils containing a polymeric shear agent to minimize the variation in viscosity due to oxidation and soot thickening. The medium-speed diesel engine lubricating oil composition comprises: (a) a major amount of a zinc-free baseline oil; and (b) a minor amount of a polymeric shear agent, which gives from 1.0 to 2.7 cSt at 100°C incremental increase in viscosity over that baseline oil; and wherein the medium-speed diesel engine lubricating oil composition meets the SAE 40 specification. The polymeric shear agents which may be used are those which can be dissolved in a mineral oil, such as ungrafted and grafted carbon- carbon polymers or copolymers.
Logan Mark Remmers
Smrcka Nancy K.
Chevron Chemical Company
Sim & Mcburney
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