1. Whisk together vegetable oil, brown sugar, cider vinegar, allspice, garlic powder and ¼ teaspoon salt. Pour into a meat injector.
2. Put pork loin onto a plate. Inject marinade into pork loin by inserting the injector in 8-10 different places and squeezing a bit into it each time. If any of the marinade has spilled onto the plate, roll the loin around in it.
3. Put loin in a plastic bag, seal, and put in the refrigerator for 2 hours.
4. Preheat oven to 350°F.
5. Put pork loin into baking dish, fat side up. Sprinkle with ½ teaspoon salt. Bake until meat reaches 145-155°F, about an hour.
6. Let rest for 15 minutes. Slice and serve.

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