my driver seat is turning like a darkish green almost black color in the back area and sides. is anyone elses doing this. the dealership told me that this is normal wear for this type of material.

 

That certainly doesn't sound normal to me. I have had several tan colored Mustangs (two verts) and the seats never changed color on me.

I would try and go to a different dealer.

Do you have pics?

 

Mine starts getting dirty after about a week of daily driving. I clean my seats at least every other week. I've been using zaino's leather cleaner, and conditioner, and under some lights it get's a greenish hue right after I clean it. But after the conditioner dries it goes away. BTW I have the Medium parchment interior what color is yours?

 

mine is the medium parchment too. i also celan and condotion about every week or two.