Space your oven racks to allow two levels for two baking sheets. Heat oven to 250.
In a large bowl, combine the oats, nuts, seeds and coconut.
In a medium-small bowl, whisk together the oil, syrup, cinnamon, salt and vanilla until combined.
Fold the wet mixture into the oats and gently stir until evenly coated.
Spread the granola evenly between two rimmed large metal baking sheets.
Bake for 1 hour 30 minutes, rotating the pans and stirring in 15-minute increments.
Cool completely before storing in an airtight container. Keeps for several weeks at room temperature.