Crankcase breathers are an essential part of any modern diesel engine. But what do these breathers do and why are they so important for diesel engines?

The problem is that it is spitting oil into the breather through the valve cover tube. Is there a cure for this? J.S., Quaker City, Ohio A–Not only is there a cure, there is a cheap and easy one.

Imagine one day, years ago, in some equipment shed out in Middle America, an innovative farmer looking at oil dripping from the bottom of the well-seasoned 5.9L Cummins engine in his Dodge Ram ...