Yes! Having your vehicle detailed before you sell it does many things:

You’ll sell your vehicle faster.
You’ll sell it for more! Market research has shown that a clean, scratch and swirl free car is valued $1,000+ more than a car that didn’t get the detail attention it needed. Statistics show that on average you’ll make back more than 3 times what you spend on your detail. That’s a no brainer and just putting money in your pocket!
A detailed engine also makes your vehicle appear better maintained and makes your buyer feel as if you cared for the car. Why do you think every dealership across the nation has their vehicles engines detailed?