I am not suprized about your Toyota dealer. They have been snake bitten with some motor designs over the years. But the dealer is performing the quicky prevention of running a solvent flush through. It is likely free. Don't know what the long term effect of solvent flushes in the yearly frequency.
The better approach would be to be cleaned up with an ARX cleaning and rinse, followed by the maintenance dose. Every UOA that I have seen shows lower wear metals, in cleaning phases, rinse phases, and in maintenance dose extended drains.
The better approach would be to be cleaned up with an ARX cleaning and rinse, followed by the maintenance dose. Every UOA that I have seen shows lower wear metals, in cleaning phases, rinse phases, and in maintenance dose extended drains.