In a mixing bowl, dissolve yeast in warm water.
Add 1/2 cup sugar, oil, salt, eggs, 4 cups of flour and 2 tsp cinnamon. Mix until combined.
Add raisins and additional flour until a soft dough has formed. You can knead this with your mixer or by hand. A total about 6-8 minutes is usually needed. The dough will still be tacky and slightly sticky but not crazy sticky.
Place in greased bowl, cover and let rise until doubled, about 1 hour. Punch dough down.
Turn onto a lightly floured surface, divide in half.
Roll into a 15 x 9 inch rectangle.
Brush with softened butter.
Combine cinnamon and remaining sugar together.
Sprinkle to about 1/2 inch of the edges.
Tightly roll up jelly roll style, starting with the short side, pinch seams to seal.
Place in 2 greased 9x5 inch loaf pans. Cover and let rise until double, about 30 minutes.
Bake at 375 for about 30 minutes or until golden brown and finished in the inside.
Remove from pans to wire rack to cool.