- Impact of Cold Oil on a Hot Engine: Generally, adding a small amount of cold oil to a hot engine isn't problematic. The engine's heat quickly warms the oil, and because oil doesn't have a high heat capacity compared to water, it doesn't cool the engine parts rapidly enough to cause damage.
- Full Oil Changes in Cold Weather: If you're doing a complete oil change in cold weather, it's advisable to drain the oil when the car is hot, allow it to cool down for about 30-40 minutes, and then refill. This helps in managing the temperature differences more effectively.
- Warming Up the Oil: A handy tip is to place the oil container under the bonnet for about 10 minutes before adding it to the engine. This can bring the oil to a more moderate temperature, reducing the temperature disparity.
- Professional Experience: Many mechanics, including those who have worked for years servicing cars, often add oil to hot engines without waiting for them to cool down. The risk of damage in these scenarios is typically low.
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