I asked my dealer to use the Spectro synthetic products instead of the HD blended oils in my bike and he told me that if I choose to use any other product other than the HD products that my warranty will be void. I am at 450 kms (sorry I'm Canadian) and am getting ready to have my first service. I don't want to use a blended product in my Ultra, does anyone know if this is true about voiding my warranty. Is there a spec sheet that Harley Davidson that names alternative products that will not void my warranty. I feel like I'm being bullied into buying an inferior product (HD).