Preheat Engine -

To give you the most relevant information, could you tell me: Is this for a or an aircraft ?

In diesel vehicles, a pigtail-shaped light indicates that the are heating the cylinder heads before starting, usually lasting 30 seconds or less. PREHEAT ENGINE

"PREHEAT ENGINE" refers to the process of warming an engine's internal components and fluids (oil and/or coolant) before starting it in cold weather, usually at or below 20°F (-7°C), to reduce wear and ensure a successful start. To give you the most relevant information, could

Generally recommended when temperatures drop below 10°F–20°F (-12°C to -7°C). usually at or below 20°F (-7°C)