Ever-ready Bran Muffins

• 6 weeks
• 4 eggs
• 5/8 rds full
• 950 ml buttermilk
• 650 gr wheat flour (whole)
• 400 gr sugar
• 230 gr wheatbran flakes
• 240 ml vegetable oil
• 14 gr baking soda
• 9 gr baking soda