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How long can a engine stay on idle?

There's no definitive answer to how long an engine can stay on idle. It depends on a lot of factors, including:

Engine type:

* Modern engines: These are generally designed to handle idling for extended periods, particularly in stop-and-go traffic.

* Older engines: These might have components that are more prone to wear and tear from prolonged idling.

Driving conditions:

* Extreme weather: Very hot or cold temperatures can put extra strain on an engine, potentially causing issues with prolonged idling.

* Altitude: Higher altitudes can affect air density, which can impact engine performance.

Engine health:

* Maintenance: A well-maintained engine will be more resilient to prolonged idling.

* Issues: Any existing engine issues, such as a clogged air filter or faulty fuel injectors, can be exacerbated by prolonged idling.

Fuel type:

* Gasoline engines: These can generally handle idling for longer periods than diesel engines.

* Diesel engines: These are more susceptible to carbon buildup and other issues from prolonged idling.

Recommendations:

* Generally: Avoid idling your engine for extended periods, especially if you're sitting still.

* Short intervals: A few minutes of idling is usually fine, particularly for warming up the engine in cold weather.

* Long periods: If you need to idle your engine for a long time, it's best to consult your owner's manual or a mechanic.

Here are some things to consider if you need to idle your engine for an extended period:

* Turn off unnecessary accessories: Turn off the air conditioning, headlights, and radio to reduce the load on the engine.

* Check fluid levels: Make sure your engine oil and coolant levels are adequate.

* Monitor engine temperature: Watch the engine temperature gauge to make sure the engine isn't overheating.

Bottom line: It's always best to avoid prolonged idling if possible. If you must idle your engine for an extended period, take precautions to minimize wear and tear.