Originally Posted By: demarpaint
It won't hurt anything, but,,,,,,,if you didn't ask for an oil change I'd make them put PU back in the car. A fresh fill at their expense, and watch them pour it in from new bottles.
What if you had an even more expensive boutique oil in your car that you just put in a hundred miles ago and they did the same thing, would you be happy about it and let it go? As it is PU isn't cheap, and the shop shouldn't take the liberty of doing unauthorized work. Maybe the hit to the wallet will teach them. Just be sure to watch them do the work, or ask for money and DIY, which is even better come to think of it.
X2. They did that without your approval. Make them replace the oil with PU and the same filter you used, OR as demarpaint said, have them reimburse you for the cost and you go get the stuff and do it to ensure it gets done. Be polite but firm that doing so is the only resolution you will accept.