Valvoline "Restore Oil" and Seat bottoms
 

Hey Crew,
I haven't posted in a while, hell I haven't driven in a while.
Time to change the cats oil. What is the opinion on the "new" Valvoline Restore Oil?
Plus, I know I read it some where but can't remember the answer. Are the seat bottoms inter-changeable? Leather is good on both but the springs/foam is sinking on the captains side.
Thanks!