I have a new 2002 Dodge 4x4 truck and am interested in using Amsoil in both front and rear differentials, in my 6 speed transmission and engine. I heard it was bad for a six speed manual transmission but the Amsoil rep says it would be good for it. Also they want me to add on a one micron filter for longer oil and engine life. So who ever is using this please tell me how it's working for you. Thank you.