It is common practice for people to leave their engines in idling mode to warm them up. But doing this takes up a considerable amount of time, wastes fuel and causes wear and tear on the engine.
The modern materials and especially the design of modern pistons and ring-sets mean they can be put under load a lot quicker, and it is advisable to do so.
Modern piston rings don’t seal as good as they should until combustion pressures are up. The only way to get higher combustion pressures is to put a load on the engine. Cold start up and warming up your engine should include warming up your gearbox and diffs.
The only way to properly cold start your engine is:
Don’t idle more than 1 minute, save your engine, and save fuel at the same time.
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