To prevent injector pumps and injectors from seizing when jet fuel is used in diesel engines, what ingredient is added to improve lubricating qualities?

The inclusion of engine oil as an additive to improve the lubricating qualities when using jet fuel in diesel engines is based on the functional role of engine oil in providing lubrication to critical engine components. Jet fuel, while efficient for combustion, lacks the necessary properties to adequately lubricate the injector pumps and injectors, leading to potential seizing and damage. Engine oil contains additives that enhance its lubricating capacity, reduce friction, and protect against wear and corrosion.

Using engine oil effectively enhances the lubrication in the system, allowing for smooth operation and extending the longevity of fuel system components, preventing costly repairs and downtime. Other options, such as grease, generally aren't suitable for this application, as they can create issues with fuel flow and injector function. Diesel additive, while beneficial for other purposes, may not specifically target lubrication in the same manner as engine oil. Water, on the other hand, would detrimentally affect the combustibility and performance of the fuel mixture, leading to engine issues. Therefore, using engine oil is the most effective method to ensure proper lubrication in this scenario.