This invention provides a coolant composition for an automobile engine which achieves retained thickening effects of a surfactant as a viscosity, and a concentrated coolant composition for an automobile engine used to obtain such coolant composition. Such coolant composition for an automobile engine comprises: (A) a silicone-based oil compound; (B) polyether-modified silicone; (C) a non-silicone-based surfactant; and (D) an aqueous base, wherein the silicone-based oil compound (A) comprises: (A1) at least one selected from among organopolysiloxanes represented by General Formula (1); and (A2) a filler, and the polyether-modified silicone (B) is at least one member selected from among polyoxyalkylene-modified organopolysiloxanes represented by General Formula (2). €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR m SiO (4-m)/2 €ƒ€ƒ€ƒ€ƒ€ƒ(1) €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR 1 2 R 3 SiO-(R 1 2 SiO) x -(R 1 R 2 SiO) y -SiR 1 2 R 3 €ƒ€ƒ€ƒ€ƒ€ƒ(2)
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机译：本发明提供了实现表面活性剂作为粘度的保留的增稠效果的用于汽车发动机的冷却剂组合物，以及用于获得这种冷却剂组合物的用于汽车发动机的浓缩的冷却剂组合物。这种用于汽车发动机的冷却剂组合物包含：（A）硅氧烷基油化合物; （B）聚醚改性的硅氧烷; （C）非硅氧烷类表面活性剂; （D）有机硅系油化合物（A）包含：（A1）选自通式（1）表示的有机聚硅氧烷中的至少一种;和（D）水性碱。聚醚改性硅酮（B）为选自通式（2）表示的聚氧化烯改性有机聚硅氧烷中的至少一种。€m SiO（4-m）/ 2€（1）R 1 2 R 3 SiO-（R 1 2 SiO）x-（R 1 R 2 SiO）y -SiR 1 2 R 3€欧元€（2）
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