Quote Originally Posted by dvldoc View Post
Better than a standard single filter system, but then again if your using low quality filters that can't filter efficiency then the difference is not much difference. But in theory it should work. The TD42's that do have the dual system do use a bypass system, They also have two different filter threads one is 3/4 16 and the other is 1-12UNF kinda weird. But I guess it keeps you from mixing up the full flow and the bypass filter.
how about for 4D56 and 4M40, when you said combo filter, it doesnt have the dual filter right?

sir, i have a 4M40 motor, please expound. because we only change 1 oil filter everytime this is a very interesting topic


PS, do you plan to do a fuel filter study as well?