What is a cold start on a car?

A cold start on a car refers to when the engine is started after the vehicle has been sitting idle for an extended period of time, usually overnight or for several hours. During a cold start, the engine has cooled down and the temperature of the air and components under the hood is lower than normal.

Cold starts can be harder on a car's engine because the oil has settled and thickened, making it more difficult for the engine to start. This can cause increased wear and tear on the engine and other components, as well as decreased fuel efficiency.

To help mitigate the effects of a cold start, it is recommended to use a synthetic oil that flows more easily when cold, keep up with regular maintenance such as oil changes, and avoid excessive idling or revving the engine during the warm-up period. Additionally, allowing the engine to warm up before driving off can help reduce strain on the engine and improve overall performance.