What causes diesel to leak into oil?
What causes diesel to leak into oil? The Causes of Fuel Dilution in Engine Oil This often happens in the region between the piston rings and the cylinder bore. Other factors include leaking of the fuel injectors, incomplete combustion of the fuel, low engine temperatures, long periods of idle time and frequent short-distance driving. Can a diesel engine have a fuel pump leak? Also, diesel engines can have external fuel pumps or more than one fuel pump in their systems. These fuel pumps are also potential leak sources. The fuel system on a diesel is very important to its operation,...