How much of a difference does a bypass oil filter make in oil filtering and it motor oil endurance and quality? And can you fit a bypass oil filter, maybe one from Amsoil, into a small car? How hard is it to install? I have occasionally thought about installing a bypass oil filter, but there is little space under the hood of a small car. It would increase the oil capacity and maybe the oil (I am currently using Schaeffer's) would last a long time. Would a bypass oil filter make a big difference in vehicles that are suspected of being sludge monsters-like the Dodge Durrango and some Toyota cars and vans?