Checking the petrol level may seem obvious, but it is all too easy to forget. Ensure that you have enough petrol to complete your journey, or at least to get you to the nearest petrol station. Be very careful not to allow dirt or water into the tank, particularly when opening the filler cap, and never fill the tank to the brim; always leave a space at the top to allow for fuel expansion under engine heat. Owners of US models should note that the flap beneath the filler cap is fitted to prevent the tank from being overfilled; the flap must never be removed or modified. See Chapter 5 - Fuel & Oil.
Note carefully the recommendations given in Chapter 5 - Fuel & Oil concerning types and grades of fuel, and never use additives of any sort.
Next Section: 4. Check the coolant level