Heat oven to 325°. Combine oats, sunflower seeds, walnuts, coconut and sesame seeds in 2 wide, shallow baking sheets. Heat oil and syrup together and drizzle over dry ingredients. Sprinkle with salt.
Bake until oats are golden, about 30 minutes, stirring every 10 minutes (be sure to get into the corners). Cool and stir in raisins, if desired. Store in a glass jar in the refrigerator.