As an automotive expert with years of experience in the field, I can provide you with a comprehensive answer to your question regarding whether it's good to start your car when it's cold.
When it comes to starting a cold car, there are several factors to consider, including the type of engine, the climate, and the current state of the vehicle. Modern engines are designed to be more efficient and less sensitive to cold starts than their older counterparts. However, even with these advancements, there are still best practices to follow to ensure the longevity and performance of your vehicle.

Firstly, it's important to understand the purpose of warming up a car. The primary goal is to allow the engine to reach its optimal operating temperature. When a car has been sitting for an extended period, especially in cold weather, the oil has settled and the engine components are at a lower temperature than they should be for efficient operation. A brief warm-up period helps to circulate the oil and gradually bring the engine up to temperature.

Secondly, the concept of "idling" has evolved over the years. Idling refers to the practice of letting the car run at a standstill while the engine warms up. While this was once a common recommendation, it's now considered less efficient and less environmentally friendly. Modern engines are designed to warm up more quickly when driven, as the EPA and DOE explain. This is because driving allows the engine to reach operating temperature more effectively than sitting idle.

Thirdly, it's crucial to differentiate between a short warm-up period and prolonged idling. Auto experts today suggest that warming up the car for no more than 30 seconds before driving is sufficient, especially in winter conditions. After this brief period, the engine will warm up more efficiently as you begin to drive. Prolonged idling not only wastes fuel but can also lead to increased emissions and potential engine wear due to the engine running at a lower temperature for an extended period.

Fourthly, there are steps you can take to further protect your engine during a cold start. Engaging a block heater, if available, can help to preheat the engine block and oil, reducing the strain on the engine during startup. Additionally, using the correct grade of motor oil for your vehicle and climate can make a significant difference in how quickly and efficiently your engine warms up.

Lastly, it's worth noting that there are exceptions to every rule. In extremely cold climates, a longer warm-up period may be necessary to ensure the safety and functionality of certain vehicle components, such as the transmission and cooling system. However, these are the exceptions rather than the rule, and it's always best to consult your vehicle's owner's manual for specific guidance.

In conclusion, while it's beneficial to allow your car to warm up before driving, especially in cold weather, the practice of idling for extended periods is outdated and inefficient. A short warm-up, followed by driving the car, is the recommended approach to ensure the health and efficiency of your vehicle's engine.

read more >>

Auto experts today say that you should warm up the car no more than 30 seconds before you start driving in winter. "The engine will warm up faster being driven," the EPA and DOE explain. Indeed, it is better to turn your engine off and start it again than to leave it idling.Dec 29, 2014read more >>