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I know that big high performance diesels are also preheated up to 24 hours before startup. Not the preheating you do with the key, prior to starting the diesel, more like when you have cooling water heaters on cars in cold climates.
This prevents the engine to smoke and build up carbon inside and of course it will allow for a shorter period before putting load on the engine.
Perhaps DieselJoe can expand on how the preheating itself is made?
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