[cleanspeed1]

^^^^^^^^^^^^Couldn't agree more about filter size. To add to that, what you want is the ability to filter down to 1 micron, which means add a bypass filter to your engine. We have several companies over here, and Filtration Solutions is probably the best. Look them up and see their offerings. Will triple the life of the engine and keep the soot out. Engines that are notoriously dirty burners will be immaculate on the inside.