I'm confused and maybe you guys can help. My new 2013 mega cab says in the owners manual that the fuel,water separators need to be changed at a specific mileage but which filters? Even Genos say the frame mounted is just a water separator but the owners manual says it is both. Do they need to be changed at the same time? The other thing is the oil filter? Do I come in from underneath , there's a plastic cover that is loose but will not come out that covers the access to the filter or do I come in from the top and thus take off a bunch of the intake system. I don't trust any dealer to do what is necessary because of past experiences. Thanks, Brett