When you burn gasoline, you produce sludge. That's why the manufacturer installs an oil filter. Over time, like cholesterol builds up in the bloodstream, sludge builds up in the engine, potentially restricting proper flow of clean oil to critical engine parts.
Check your oil dipstick even 5 miles after an oil change, and you will see that the oil is already “dirty”. That's because, during a normal oil change, up to 1/2 quart of sludge, old contaminated oil and friction causing abrasives remain in the engine. These contaminates rob the engine of peak performance and can cause early engine failure. Power flushing
them out increases oil flow and reduces friction, which means better performance and longer engine life.
This is a typical oil pan before and after the engine has been power flushed by the Engine Life Guard System.