Flushing oil system with diesel fuel?
I have heard that flushing the oil system with diesel fuel is a good idea every so often. I've been told to drain the old oil out, change the filter with a cheap one, dump in 3 quarts of cheap oil of the correct grade, add 1 quart of diesel fuel the run
Absolute nonesense!
Diesel fuel does not have the required lubrication properties for the engine.
Current, modern engine oils have all the necessary "cleaners" already in them.
Simply change the oil and filter per the operator's



