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When we say that the car must be at working temperature, i.e. (90 C, 194F) is this temperature that of the coolant or the oil?

Thanks.

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  • Welcome to Motor Vehicle Maintenance & Repair! Commented Jun 11 at 12:58

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The working temps of coolant should be around 100-110°C (212-230°F or maybe even a bit higher depending on how the engineers setup the engine) of most engines today. This website states oil should be about 115°C (240°F) on gasoline engines and 99°C (210°F) on diesel engines. While the 90°C temp you're talking about is close, I don't think it can be claimed it applies to either as a working temperature.

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