If your Blackstone is new, you should wash it well with hot soapy water, followed by a rinse with clean water. Dry your flattop with paper towel before continuing. If your griddle is not new, but needs a clean, wash it, rinse it and dry it, the same way.

Heat the griddle over medium-high heat for 10 - 15 minutes. If it's new, you may notice a color change from a grey to a brownish color, this is normal, metals can change color the first time they are heated.

Add 2- 3 tablespoons of your chosen oil to the griddle and spread the oil around the entire surface of the griddle with a lint-free cloth held by tongs. I like to use a flour sack towel, I find them to be generally pretty lint-free! Ensure you're wiping ALL the edges, sides, and corners, not just the griddle top. You may find you need heat resistant gloves, but I've always been fine with just the tongs.

The oil will start to smoke, and then eventually it will stop smoking. Once the oil has stopped smoking, repeat step 3 twice more.

After 3 cycles of oiling and heating, allow the griddle to cool down slightly before spreading another thin layer of oil, ensuring to cover all edges, sides, and corners.

Once the griddle is completely cooled, it can be covered for storage.