* Clog fuel injectors: Oil is much thicker than diesel fuel and will not atomize properly, leading to clogged injectors and potentially requiring expensive repairs or replacements.
* Damage the fuel pump: The increased viscosity can strain and damage the fuel pump.
* Increase emissions: Incomplete combustion due to the oil will result in higher emissions.
* Cause lubrication problems: While diesel fuel lubricates the fuel system components to some degree, oil doesn't replace this and can even lead to increased wear.
In short, adding oil to diesel fuel is a serious mistake that can lead to costly engine repairs. If you accidentally add oil, do not start your engine. You'll need to drain the contaminated fuel and have the system thoroughly cleaned or flushed.
