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Message: [QUOTE="Wildman, post: 1521509, member: 18533"] No need to worry; the "typewriter" is completely normal on heavy duty diesel engines. Ford released a service bulletin to inform dealers that no diagnosis or repairs are necessary. The noise is simply more audible on the 6.7 because its such a quiet engine to begin with. The noise you are hearing is the result of clean pressurized oil flowing through the main bearings under hydrodynamic lubrication. The intensity of the noise can vary from engine to engine based on build tolerances. As the oil becomes dirtier with more particulate matter, the noise dissipates. In early models, Ford used to send dealers a vile of carbon black (soot) to dump into the oil, which simulated dirty oil and minimized the noise. This phenomenon has nothing to do with incorrect oil viscosity or engine damage. As per the owner's manual, the best oil you can run in the 6.7 is 5W-30 Full Synthetic Diesel Engine Oil. [/QUOTE]

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