my truck has 134k on it ive run rotella in it since i owned it. the dealer knew the last owner (or so he said) and that what he had ran. would it hurt the motor to change to a different brand like royal purple?

It wont hurt anything at all, dont worry about it.

jdman, what's the story behind all the carnage of machinery in your avatar and in the garage pics?:D

That CAT excavator looks like it fell down a mountain or off a haul truck.

I've been in the same industry all my life and seen and worked on lots of damaged and burned machines so I was just curious.

Thanks!:D ;)