will using Biodiesel or SVO in a 1984 F250 6.9L cause me problems with seals and hoses? I need to replace/rebuild my IP, do all the rebuilders now use viton seals in everything they do? or could I end up getting one with rubber seals if I just go out and buy a rebuilt? and if I get a o-ring seal kit will it be viton? how can I tell if they are viton?