Crankcase breathers play a big role in reducing diesel engine emissions by recirculating blow-by gases back into the engine.

Whether it's in the form of a simple breather, or a more effective PCV system ... whether through the rear main seal, timing cover, valve covers You get the point. A positive crankcase ventilation ...

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 ...