[Y-Blockhead]

Originally Posted by Railcarmover

Diesel grade oils have higher shear properties, better detergent and soot entrainment properties and better viscosity modifier properties than gasoline engine grade oils.Entrainment properties hold dirt and soot in suspension, allowing it to be removed with the drain instead of depositing on parts,critical with engine not running an air filter.

One thing that we tend to overlook is detergent oils do suspend dirt and soot, in turn circulating them through the engine bearings and other wear points. *Non-detergent oil allows the dirt and soot to settle out into the pan.

This is why I am a proponent of adding filters to the Model A, both oil and air filters.

*I'm not proposing anyone use non-detergent oil, I use Chevron Delo 400 15w40.