Engines wear out due to different problems. If you overheat the motor and blow a head gasket, a great oil filter isn't going to help you. Years ago, it was determined that engine wear was related directly to the weight of contaminates in the oil. A bypass filter removes the contamination products that cause wear. The more contaminates the filter picks up the less wear the engine will see. In the late 80's early 90's Mack and Peterbilt added oil bypass filters and synthetic air filters to their trucks as standard equipment and engine life went from 350,000 to over 1,000,000 miles. Most of the gains in longevity were attributed to the filtration, though I also notice that considerable effort was put into improving the valve seats and the piston ring pack to handle the improved lifespan of the other components.How this relates to gasoline engines is not entirely clear.
My experience is that bypass filtration systems work pretty well. The single biggest problem is getting them correctly plumbed so that they do not leak. I have seen three engines completely destroyed by the bypass plumbing coming unstuck. The second biggest problem is just finding a place to put the filter.
My experience is that bypass filtration systems work pretty well. The single biggest problem is getting them correctly plumbed so that they do not leak. I have seen three engines completely destroyed by the bypass plumbing coming unstuck. The second biggest problem is just finding a place to put the filter.