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Constant running for hours on end can glaze the bores and cause excessive oil consumption on some engines. This is the reason to stick to the manufacturers oil type/viscosity ratings and recommendations.
A turbo charged engine running at a constant low speed needs to be run at high speed for 20/30 minutes to raise the engine temperature and burn off carbon deposits from the turbocharger blades.
For a long working life every engine should be run at idle for 5 minutes after a hard run to dissipate hot spots in the engine block, this is especially important for turbo engines whether they are fitted in a boat/truck or car.
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