I have just seen multiple reports lately of pretty dirty engines that had been run on it for a while.
@Hohn had a very varnished Honda that he cleaned up with Valvoline Restore and Protect that had been run on PP for its life. He was completely loading up oil filters of the junk left behind by PP.
This is from an engine run on PP.
Feel free to run what you like. It's a crowded field, and there are many far better oils for the same price, so I see no reason to run it. But feel free. I'm sure a mechanic would love to do a ring job on your Impreza from the junk left behind on your piston rings, if Valvoline Restore and Protect can't clean them up.