Add yeast and 1/2 tbsp sugar to 1/4 cup warm water and let sit to activate.
Scald milk and add to cold water in a large mixing bowl if you are kneading by hand or Kitchen Aid mixing bowl if you are using the dough hook attachment.
Add the activated yeast to the milk and water mixture. Add vegetable oil, salt and 3/8 cup sugar. Stir together.
Add 5 cups of flour to the liquid mixture. Use the dough hook on your mixer on medium speed or a wooden spoon to begin mixing the flour with the liquids. Scrape the sides often to get everything incorporated well. Hand Kneading -Once incorporated, turn out on a floured surface and knead until it is a well formed ball. Dough Hook -If you are using your dough hook and mixer, continue on medium speed for a minute or two rather than kneading by hand. Assess the dough and slowly add more flour if it's really sticky - I add about a quarter cup at a time until I have a ball of dough that I can handle but is still just slightly sticky to the touch. Knead or mix well after adding flour. Place dough ball in a large greased bowl, cover with greased plastic wrap and place in a warm spot to rise. Make sure your plastic wrap is on loosely so gas can escape as the dough rises. I turn my oven on to preheat for a minute or two, then turn it off and place my bowl inside. Let rise until dough has doubled in size, about an hour and a half.
Punch down and reshape. Let rise for another hour and a half.
Roll dough out into a large rectangle that is about 1/3 inch thick and cover completely with a thin layer of room temp butter (1/4 cup).
Add brown sugar and spread over dough. Sprinkle cinnamon evenly across brown sugar covered dough.
Roll up and slice into rolls about 1 1/2 inch wide. I use floss to cut them easily, a serrated knife works well too. The rolls will be fairly tall if you cut them wider than 1 1/2 inch.
Place in greased pans. If you cut the rolls 1 1/2 inch wide, this recipe will make two 9x13 pans and an 8x8. I put 6 rolls in the 9x13 pans and 3-4 in the 8x8 pan. MAKE SURE TO GIVE THE ROLLS PLENTY OF SPACE. They really expand in size and won't be nearly as light and fluffy if they don't have lots of room.
Let the rolls rise for another 1-1 1/2 hours or until the rolls look filled out and have risen appropriately.
Bake at 350° for 20-25 minutes or until golden on top. Remove from the oven and let cool for 5 minutes.