Combine the water, salt, syrup, garlic, and thyme in a bowl, and then whisk.
Place the pork loin in a large ziplock bag and add brine.
Let the pork loin sit in the brine refrigerated for 6-12 hours.
Remove loin from brine and pat dry.
Rub the surface of the loin with oil.
Sprinkle rub over loin, make sure the entire surface is covered.
Smoke the pork loin at 225 degrees until the internal temperature hits 140 degrees.
Let rest for 15 minutes before slicing to allow for internal temp to rise, and the juices to redistribute.
Notes
I use Morton's Coarse Grain Kosher Salt for the brine. Using a different brand or type of salt will change the recipe. Be especially careful not to use table salt in the brine.