What damage does cold start fluid cause to the engine?

[Jenkins]

Cold start fluid does not damage the engine, but long-term use of start fluid can lead to increased engine wear. This is because most start fluids are primarily composed of flammable and volatile alkanes, which can cause rough engine operation, accelerated wear, and further deterioration of engine performance. When the engine is difficult to start, the cause should be promptly identified and resolved to extend the engine's service life. Before each use of start fluid, it is advisable to preheat the engine appropriately with hot water or other methods to raise the starting temperature. Avoid directly spraying cold start fluid, as this may start the engine but can easily lead to poor lubrication, exacerbating component wear.