which is unreasonableYes, it is.
But if that was tested and they got proof of it. Then it's 100% legit.
You can prove them wrong if you test the oil the way they advertise it (at least 4 OCI). Then measure the percentage cleaned and find out if it's 100% or lower. That means to open apart your engine and took as many pictures as possible (particularly of pistons and piston rings) before and after the use of Valvoline Restore and Protect.